diff --git a/src/libraries/System.Net.Primitives/ref/System.Net.Primitives.cs b/src/libraries/System.Net.Primitives/ref/System.Net.Primitives.cs
index 6aa30c59700426..00250e07d8f328 100644
--- a/src/libraries/System.Net.Primitives/ref/System.Net.Primitives.cs
+++ b/src/libraries/System.Net.Primitives/ref/System.Net.Primitives.cs
@@ -81,9 +81,9 @@ public void Add(System.Net.Cookie cookie) { }
         public void Add(System.Net.CookieCollection cookies) { }
         public void Add(System.Uri uri, System.Net.Cookie cookie) { }
         public void Add(System.Uri uri, System.Net.CookieCollection cookies) { }
+        public System.Net.CookieCollection GetAllCookies() { throw null; }
         public string GetCookieHeader(System.Uri uri) { throw null; }
         public System.Net.CookieCollection GetCookies(System.Uri uri) { throw null; }
-        public System.Net.CookieCollection GetAllCookies() { throw null; }
         public void SetCookies(System.Uri uri, string cookieHeader) { }
     }
     public partial class CookieException : System.FormatException, System.Runtime.Serialization.ISerializable
@@ -516,11 +516,11 @@ public enum SslProtocols
         Ssl2 = 12,
         [System.ObsoleteAttribute("SslProtocols.Ssl3 has been deprecated and is not supported.")]
         Ssl3 = 48,
-        [System.ObsoleteAttribute("TLS versions 1.0 and 1.1 have known vulnerabilities and are not recommended. Use a newer TLS version instead, or use SslProtocols.None to defer to OS defaults.", DiagnosticId = "SYSLIB0039", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
+        [System.ObsoleteAttribute("TLS versions 1.0 and 1.1 have known vulnerabilities and are not recommended. Use a newer TLS version instead, or use SslProtocols.None to defer to OS defaults.", DiagnosticId="SYSLIB0039", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
         Tls = 192,
         [System.ObsoleteAttribute("SslProtocols.Default has been deprecated and is not supported.")]
         Default = 240,
-        [System.ObsoleteAttribute("TLS versions 1.0 and 1.1 have known vulnerabilities and are not recommended. Use a newer TLS version instead, or use SslProtocols.None to defer to OS defaults.", DiagnosticId = "SYSLIB0039", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
+        [System.ObsoleteAttribute("TLS versions 1.0 and 1.1 have known vulnerabilities and are not recommended. Use a newer TLS version instead, or use SslProtocols.None to defer to OS defaults.", DiagnosticId="SYSLIB0039", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
         Tls11 = 768,
         Tls12 = 3072,
         Tls13 = 12288,
@@ -530,8 +530,8 @@ namespace System.Security.Authentication.ExtendedProtection
 {
     public abstract partial class ChannelBinding : Microsoft.Win32.SafeHandles.SafeHandleZeroOrMinusOneIsInvalid
     {
-        protected ChannelBinding() : base(default(bool)) { }
-        protected ChannelBinding(bool ownsHandle) : base(default(bool)) { }
+        protected ChannelBinding() : base (default(bool)) { }
+        protected ChannelBinding(bool ownsHandle) : base (default(bool)) { }
         public abstract int Size { get; }
     }
     public enum ChannelBindingKind
diff --git a/src/libraries/System.Net.Primitives/src/ReferenceAssemblyExclusions.txt b/src/libraries/System.Net.Primitives/src/ReferenceAssemblyExclusions.txt
new file mode 100644
index 00000000000000..a7985395c17729
--- /dev/null
+++ b/src/libraries/System.Net.Primitives/src/ReferenceAssemblyExclusions.txt
@@ -0,0 +1,3 @@
+# Needed for serialization
+T:System.Net.CookieVariant
+T:System.Net.PathList
diff --git a/src/libraries/System.Net.Primitives/src/System.Net.Primitives.csproj b/src/libraries/System.Net.Primitives/src/System.Net.Primitives.csproj
index 00e7da3d4da3c9..84a5864cac9025 100644
--- a/src/libraries/System.Net.Primitives/src/System.Net.Primitives.csproj
+++ b/src/libraries/System.Net.Primitives/src/System.Net.Primitives.csproj
@@ -11,6 +11,7 @@
   <PropertyGroup>
     <TargetPlatformIdentifier>$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)'))</TargetPlatformIdentifier>
     <GeneratePlatformNotSupportedAssemblyMessage Condition="'$(TargetPlatformIdentifier)' == ''">SR.PlatformNotSupported_NetPrimitives</GeneratePlatformNotSupportedAssemblyMessage>
+    <GenAPIExcludeApiList>ReferenceAssemblyExclusions.txt</GenAPIExcludeApiList>
   </PropertyGroup>
   <ItemGroup Condition="'$(TargetPlatformIdentifier)' != ''">
     <Compile Include="System\Net\AuthenticationSchemes.cs" />
diff --git a/src/libraries/System.Net.Security/ref/System.Net.Security.cs b/src/libraries/System.Net.Security/ref/System.Net.Security.cs
index 455bdb09d01ba7..76589add6b2015 100644
--- a/src/libraries/System.Net.Security/ref/System.Net.Security.cs
+++ b/src/libraries/System.Net.Security/ref/System.Net.Security.cs
@@ -29,9 +29,9 @@ public CipherSuitesPolicy(System.Collections.Generic.IEnumerable<System.Net.Secu
     public enum EncryptionPolicy
     {
         RequireEncryption = 0,
-        [System.ObsoleteAttribute("EncryptionPolicy.NoEncryption and AllowEncryption significantly reduce security and should not be used in production code.", DiagnosticId = "SYSLIB0040", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
+        [System.ObsoleteAttribute("EncryptionPolicy.NoEncryption and AllowEncryption significantly reduce security and should not be used in production code.", DiagnosticId="SYSLIB0040", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
         AllowNoEncryption = 1,
-        [System.ObsoleteAttribute("EncryptionPolicy.NoEncryption and AllowEncryption significantly reduce security and should not be used in production code.", DiagnosticId = "SYSLIB0040", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
+        [System.ObsoleteAttribute("EncryptionPolicy.NoEncryption and AllowEncryption significantly reduce security and should not be used in production code.", DiagnosticId="SYSLIB0040", UrlFormat="https://aka.ms/dotnet-warnings/{0}")]
         NoEncryption = 2,
     }
     public delegate System.Security.Cryptography.X509Certificates.X509Certificate LocalCertificateSelectionCallback(object sender, string targetHost, System.Security.Cryptography.X509Certificates.X509CertificateCollection localCertificates, System.Security.Cryptography.X509Certificates.X509Certificate? remoteCertificate, string[] acceptableIssuers);
@@ -94,12 +94,12 @@ public override void Flush() { }
         public override System.Threading.Tasks.Task FlushAsync(System.Threading.CancellationToken cancellationToken) { throw null; }
         public override int Read(byte[] buffer, int offset, int count) { throw null; }
         public override System.Threading.Tasks.Task<int> ReadAsync(byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken) { throw null; }
-        public override System.Threading.Tasks.ValueTask<int> ReadAsync(System.Memory<byte> buffer, System.Threading.CancellationToken cancellationToken = default) { throw null; }
+        public override System.Threading.Tasks.ValueTask<int> ReadAsync(System.Memory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public override long Seek(long offset, System.IO.SeekOrigin origin) { throw null; }
         public override void SetLength(long value) { }
         public override void Write(byte[] buffer, int offset, int count) { }
         public override System.Threading.Tasks.Task WriteAsync(byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken) { throw null; }
-        public override System.Threading.Tasks.ValueTask WriteAsync(System.ReadOnlyMemory<byte> buffer, System.Threading.CancellationToken cancellationToken = default) { throw null; }
+        public override System.Threading.Tasks.ValueTask WriteAsync(System.ReadOnlyMemory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
     }
     public enum ProtectionLevel
     {
@@ -107,15 +107,9 @@ public enum ProtectionLevel
         Sign = 1,
         EncryptAndSign = 2,
     }
-    public readonly struct SslClientHelloInfo
-    {
-        public string ServerName { get; }
-        public System.Security.Authentication.SslProtocols SslProtocols { get; }
-        internal SslClientHelloInfo(string serverName, System.Security.Authentication.SslProtocols sslProtocol) { throw null; }
-    }
     public delegate bool RemoteCertificateValidationCallback(object sender, System.Security.Cryptography.X509Certificates.X509Certificate? certificate, System.Security.Cryptography.X509Certificates.X509Chain? chain, System.Net.Security.SslPolicyErrors sslPolicyErrors);
     public delegate System.Security.Cryptography.X509Certificates.X509Certificate ServerCertificateSelectionCallback(object sender, string? hostName);
-    public delegate System.Threading.Tasks.ValueTask<SslServerAuthenticationOptions> ServerOptionsSelectionCallback(SslStream stream, SslClientHelloInfo clientHelloInfo, object? state, System.Threading.CancellationToken cancellationToken);
+    public delegate System.Threading.Tasks.ValueTask<System.Net.Security.SslServerAuthenticationOptions> ServerOptionsSelectionCallback(System.Net.Security.SslStream stream, System.Net.Security.SslClientHelloInfo clientHelloInfo, object? state, System.Threading.CancellationToken cancellationToken);
     public readonly partial struct SslApplicationProtocol : System.IEquatable<System.Net.Security.SslApplicationProtocol>
     {
         private readonly object _dummy;
@@ -127,30 +121,17 @@ public readonly struct SslClientHelloInfo
         public SslApplicationProtocol(string protocol) { throw null; }
         public System.ReadOnlyMemory<byte> Protocol { get { throw null; } }
         public bool Equals(System.Net.Security.SslApplicationProtocol other) { throw null; }
-        public override bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhen(true)] object? obj) { throw null; }
+        public override bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhenAttribute(true)] object? obj) { throw null; }
         public override int GetHashCode() { throw null; }
         public static bool operator ==(System.Net.Security.SslApplicationProtocol left, System.Net.Security.SslApplicationProtocol right) { throw null; }
         public static bool operator !=(System.Net.Security.SslApplicationProtocol left, System.Net.Security.SslApplicationProtocol right) { throw null; }
         public override string ToString() { throw null; }
     }
-
     public sealed partial class SslCertificateTrust
     {
-        public static SslCertificateTrust CreateForX509Store(
-                                                System.Security.Cryptography.X509Certificates.X509Store store,
-                                                bool sendTrustInHandshake = false) { throw null;  }
-        public static SslCertificateTrust CreateForX509Collection(
-                                                System.Security.Cryptography.X509Certificates.X509Certificate2Collection trustList,
-                                                bool sendTrustInHandshake = false) { throw null; }
-        private SslCertificateTrust() { throw null; }
-   }
-
-    public sealed partial class SslStreamCertificateContext
-    {
-        internal SslStreamCertificateContext() { throw null; }
-        [System.ComponentModel.EditorBrowsable(System.ComponentModel.EditorBrowsableState.Never)]
-        public static SslStreamCertificateContext Create(System.Security.Cryptography.X509Certificates.X509Certificate2 target, System.Security.Cryptography.X509Certificates.X509Certificate2Collection? additionalCertificates, bool offline) { throw null; }
-        public static SslStreamCertificateContext Create(System.Security.Cryptography.X509Certificates.X509Certificate2 target, System.Security.Cryptography.X509Certificates.X509Certificate2Collection? additionalCertificates, bool offline = false, SslCertificateTrust? trust = null) { throw null; }
+        internal SslCertificateTrust() { }
+        public static System.Net.Security.SslCertificateTrust CreateForX509Collection(System.Security.Cryptography.X509Certificates.X509Certificate2Collection trustList, bool sendTrustInHandshake = false) { throw null; }
+        public static System.Net.Security.SslCertificateTrust CreateForX509Store(System.Security.Cryptography.X509Certificates.X509Store store, bool sendTrustInHandshake = false) { throw null; }
     }
     public partial class SslClientAuthenticationOptions
     {
@@ -166,6 +147,13 @@ public SslClientAuthenticationOptions() { }
         public System.Net.Security.RemoteCertificateValidationCallback? RemoteCertificateValidationCallback { get { throw null; } set { } }
         public string? TargetHost { get { throw null; } set { } }
     }
+    public readonly partial struct SslClientHelloInfo
+    {
+        private readonly object _dummy;
+        private readonly int _dummyPrimitive;
+        public string ServerName { get { throw null; } }
+        public System.Security.Authentication.SslProtocols SslProtocols { get { throw null; } }
+    }
     public partial class SslServerAuthenticationOptions
     {
         public SslServerAuthenticationOptions() { }
@@ -228,11 +216,11 @@ public void AuthenticateAsServer(System.Net.Security.SslServerAuthenticationOpti
         public virtual void AuthenticateAsServer(System.Security.Cryptography.X509Certificates.X509Certificate serverCertificate) { }
         public virtual void AuthenticateAsServer(System.Security.Cryptography.X509Certificates.X509Certificate serverCertificate, bool clientCertificateRequired, bool checkCertificateRevocation) { }
         public virtual void AuthenticateAsServer(System.Security.Cryptography.X509Certificates.X509Certificate serverCertificate, bool clientCertificateRequired, System.Security.Authentication.SslProtocols enabledSslProtocols, bool checkCertificateRevocation) { }
+        public System.Threading.Tasks.Task AuthenticateAsServerAsync(System.Net.Security.ServerOptionsSelectionCallback optionsCallback, object? state, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public System.Threading.Tasks.Task AuthenticateAsServerAsync(System.Net.Security.SslServerAuthenticationOptions sslServerAuthenticationOptions, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public virtual System.Threading.Tasks.Task AuthenticateAsServerAsync(System.Security.Cryptography.X509Certificates.X509Certificate serverCertificate) { throw null; }
         public virtual System.Threading.Tasks.Task AuthenticateAsServerAsync(System.Security.Cryptography.X509Certificates.X509Certificate serverCertificate, bool clientCertificateRequired, bool checkCertificateRevocation) { throw null; }
         public virtual System.Threading.Tasks.Task AuthenticateAsServerAsync(System.Security.Cryptography.X509Certificates.X509Certificate serverCertificate, bool clientCertificateRequired, System.Security.Authentication.SslProtocols enabledSslProtocols, bool checkCertificateRevocation) { throw null; }
-        public System.Threading.Tasks.Task AuthenticateAsServerAsync(ServerOptionsSelectionCallback optionsCallback, object? state, System.Threading.CancellationToken cancellationToken = default) { throw null; }
         public virtual System.IAsyncResult BeginAuthenticateAsClient(string targetHost, System.AsyncCallback? asyncCallback, object? asyncState) { throw null; }
         public virtual System.IAsyncResult BeginAuthenticateAsClient(string targetHost, System.Security.Cryptography.X509Certificates.X509CertificateCollection? clientCertificates, bool checkCertificateRevocation, System.AsyncCallback? asyncCallback, object? asyncState) { throw null; }
         public virtual System.IAsyncResult BeginAuthenticateAsClient(string targetHost, System.Security.Cryptography.X509Certificates.X509CertificateCollection? clientCertificates, System.Security.Authentication.SslProtocols enabledSslProtocols, bool checkCertificateRevocation, System.AsyncCallback? asyncCallback, object? asyncState) { throw null; }
@@ -263,6 +251,13 @@ public override void Write(byte[] buffer, int offset, int count) { }
         public override System.Threading.Tasks.Task WriteAsync(byte[] buffer, int offset, int count, System.Threading.CancellationToken cancellationToken) { throw null; }
         public override System.Threading.Tasks.ValueTask WriteAsync(System.ReadOnlyMemory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
     }
+    public partial class SslStreamCertificateContext
+    {
+        internal SslStreamCertificateContext() { }
+        [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
+        public static System.Net.Security.SslStreamCertificateContext Create(System.Security.Cryptography.X509Certificates.X509Certificate2 target, System.Security.Cryptography.X509Certificates.X509Certificate2Collection? additionalCertificates, bool offline) { throw null; }
+        public static System.Net.Security.SslStreamCertificateContext Create(System.Security.Cryptography.X509Certificates.X509Certificate2 target, System.Security.Cryptography.X509Certificates.X509Certificate2Collection? additionalCertificates, bool offline = false, System.Net.Security.SslCertificateTrust? trust = null) { throw null; }
+    }
     [System.CLSCompliantAttribute(false)]
     public enum TlsCipherSuite : ushort
     {
diff --git a/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs b/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs
index 3eec205b412966..e60d1d45653342 100644
--- a/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs
+++ b/src/libraries/System.Net.Sockets/ref/System.Net.Sockets.cs
@@ -80,8 +80,8 @@ public partial struct IPPacketInformation : System.IEquatable<System.Net.Sockets
         private int _dummyPrimitive;
         public System.Net.IPAddress Address { get { throw null; } }
         public int Interface { get { throw null; } }
-        public override bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhen(true)] object? comparand) { throw null; }
         public bool Equals(System.Net.Sockets.IPPacketInformation other) { throw null; }
+        public override bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhenAttribute(true)] object? comparand) { throw null; }
         public override int GetHashCode() { throw null; }
         public static bool operator ==(System.Net.Sockets.IPPacketInformation packetInformation1, System.Net.Sockets.IPPacketInformation packetInformation2) { throw null; }
         public static bool operator !=(System.Net.Sockets.IPPacketInformation packetInformation1, System.Net.Sockets.IPPacketInformation packetInformation2) { throw null; }
@@ -224,6 +224,7 @@ public sealed partial class SafeSocketHandle : Microsoft.Win32.SafeHandles.SafeH
     {
         public SafeSocketHandle() : base (default(bool)) { }
         public SafeSocketHandle(System.IntPtr preexistingHandle, bool ownsHandle) : base (default(bool)) { }
+        public override bool IsInvalid { get { throw null; } }
         protected override bool ReleaseHandle() { throw null; }
     }
     public enum SelectMode
@@ -237,11 +238,11 @@ public partial class SendPacketsElement
         public SendPacketsElement(byte[] buffer) { }
         public SendPacketsElement(byte[] buffer, int offset, int count) { }
         public SendPacketsElement(byte[] buffer, int offset, int count, bool endOfPacket) { }
-        public SendPacketsElement(ReadOnlyMemory<byte> buffer) { }
-        public SendPacketsElement(ReadOnlyMemory<byte> buffer, bool endOfPacket) { }
         public SendPacketsElement(System.IO.FileStream fileStream) { }
         public SendPacketsElement(System.IO.FileStream fileStream, long offset, int count) { }
         public SendPacketsElement(System.IO.FileStream fileStream, long offset, int count, bool endOfPacket) { }
+        public SendPacketsElement(System.ReadOnlyMemory<byte> buffer) { }
+        public SendPacketsElement(System.ReadOnlyMemory<byte> buffer, bool endOfPacket) { }
         public SendPacketsElement(string filepath) { }
         public SendPacketsElement(string filepath, int offset, int count) { }
         public SendPacketsElement(string filepath, int offset, int count, bool endOfPacket) { }
@@ -252,14 +253,14 @@ public SendPacketsElement(string filepath, long offset, int count, bool endOfPac
         public bool EndOfPacket { get { throw null; } }
         public string? FilePath { get { throw null; } }
         public System.IO.FileStream? FileStream { get { throw null; } }
-        public ReadOnlyMemory<byte>? MemoryBuffer { get { throw null; } }
+        public System.ReadOnlyMemory<byte>? MemoryBuffer { get { throw null; } }
         public int Offset { get { throw null; } }
         public long OffsetLong { get { throw null; } }
     }
     public partial class Socket : System.IDisposable
     {
-        public Socket(System.Net.Sockets.SafeSocketHandle handle) { }
         public Socket(System.Net.Sockets.AddressFamily addressFamily, System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType) { }
+        public Socket(System.Net.Sockets.SafeSocketHandle handle) { }
         [System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")]
         public Socket(System.Net.Sockets.SocketInformation socketInformation) { }
         public Socket(System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType) { }
@@ -294,15 +295,15 @@ public Socket(System.Net.Sockets.SocketType socketType, System.Net.Sockets.Proto
         [System.ObsoleteAttribute("SupportsIPv6 has been deprecated. Use OSSupportsIPv6 instead.")]
         public static bool SupportsIPv6 { get { throw null; } }
         public short Ttl { get { throw null; } set { } }
-        [System.ObsoleteAttribute("UseOnlyOverlappedIO has been deprecated and is not supported.")]
         [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
+        [System.ObsoleteAttribute("UseOnlyOverlappedIO has been deprecated and is not supported.")]
         public bool UseOnlyOverlappedIO { get { throw null; } set { } }
         public System.Net.Sockets.Socket Accept() { throw null; }
         public System.Threading.Tasks.Task<System.Net.Sockets.Socket> AcceptAsync() { throw null; }
-        public System.Threading.Tasks.ValueTask<System.Net.Sockets.Socket> AcceptAsync(System.Threading.CancellationToken cancellationToken) { throw null; }
         public System.Threading.Tasks.Task<System.Net.Sockets.Socket> AcceptAsync(System.Net.Sockets.Socket? acceptSocket) { throw null; }
         public System.Threading.Tasks.ValueTask<System.Net.Sockets.Socket> AcceptAsync(System.Net.Sockets.Socket? acceptSocket, System.Threading.CancellationToken cancellationToken) { throw null; }
         public bool AcceptAsync(System.Net.Sockets.SocketAsyncEventArgs e) { throw null; }
+        public System.Threading.Tasks.ValueTask<System.Net.Sockets.Socket> AcceptAsync(System.Threading.CancellationToken cancellationToken) { throw null; }
         public System.IAsyncResult BeginAccept(System.AsyncCallback? callback, object? state) { throw null; }
         public System.IAsyncResult BeginAccept(int receiveSize, System.AsyncCallback? callback, object? state) { throw null; }
         public System.IAsyncResult BeginAccept(System.Net.Sockets.Socket? acceptSocket, int receiveSize, System.AsyncCallback? callback, object? state) { throw null; }
@@ -338,13 +339,13 @@ public void Connect(string host, int port) { }
         public System.Threading.Tasks.ValueTask ConnectAsync(System.Net.IPAddress address, int port, System.Threading.CancellationToken cancellationToken) { throw null; }
         public System.Threading.Tasks.Task ConnectAsync(System.Net.IPAddress[] addresses, int port) { throw null; }
         public System.Threading.Tasks.ValueTask ConnectAsync(System.Net.IPAddress[] addresses, int port, System.Threading.CancellationToken cancellationToken) { throw null; }
-        public System.Threading.Tasks.Task ConnectAsync(string host, int port) { throw null; }
-        public System.Threading.Tasks.ValueTask ConnectAsync(string host, int port, System.Threading.CancellationToken cancellationToken) { throw null; }
         public bool ConnectAsync(System.Net.Sockets.SocketAsyncEventArgs e) { throw null; }
         public static bool ConnectAsync(System.Net.Sockets.SocketType socketType, System.Net.Sockets.ProtocolType protocolType, System.Net.Sockets.SocketAsyncEventArgs e) { throw null; }
+        public System.Threading.Tasks.Task ConnectAsync(string host, int port) { throw null; }
+        public System.Threading.Tasks.ValueTask ConnectAsync(string host, int port, System.Threading.CancellationToken cancellationToken) { throw null; }
         public void Disconnect(bool reuseSocket) { }
+        public System.Threading.Tasks.ValueTask DisconnectAsync(bool reuseSocket, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public bool DisconnectAsync(System.Net.Sockets.SocketAsyncEventArgs e) { throw null; }
-        public System.Threading.Tasks.ValueTask DisconnectAsync(bool reuseSocket, System.Threading.CancellationToken cancellationToken = default) { throw null; }
         public void Dispose() { }
         protected virtual void Dispose(bool disposing) { }
         [System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")]
@@ -388,8 +389,8 @@ public void Listen(int backlog) { }
         public System.Threading.Tasks.Task<int> ReceiveAsync(System.ArraySegment<byte> buffer, System.Net.Sockets.SocketFlags socketFlags) { throw null; }
         public System.Threading.Tasks.Task<int> ReceiveAsync(System.Collections.Generic.IList<System.ArraySegment<byte>> buffers) { throw null; }
         public System.Threading.Tasks.Task<int> ReceiveAsync(System.Collections.Generic.IList<System.ArraySegment<byte>> buffers, System.Net.Sockets.SocketFlags socketFlags) { throw null; }
-        public System.Threading.Tasks.ValueTask<int> ReceiveAsync(System.Memory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public System.Threading.Tasks.ValueTask<int> ReceiveAsync(System.Memory<byte> buffer, System.Net.Sockets.SocketFlags socketFlags, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public System.Threading.Tasks.ValueTask<int> ReceiveAsync(System.Memory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public bool ReceiveAsync(System.Net.Sockets.SocketAsyncEventArgs e) { throw null; }
         public int ReceiveFrom(byte[] buffer, int offset, int size, System.Net.Sockets.SocketFlags socketFlags, ref System.Net.EndPoint remoteEP) { throw null; }
         public int ReceiveFrom(byte[] buffer, int size, System.Net.Sockets.SocketFlags socketFlags, ref System.Net.EndPoint remoteEP) { throw null; }
@@ -406,8 +407,8 @@ public void Listen(int backlog) { }
         public int ReceiveMessageFrom(System.Span<byte> buffer, ref System.Net.Sockets.SocketFlags socketFlags, ref System.Net.EndPoint remoteEP, out System.Net.Sockets.IPPacketInformation ipPacketInformation) { throw null; }
         public System.Threading.Tasks.Task<System.Net.Sockets.SocketReceiveMessageFromResult> ReceiveMessageFromAsync(System.ArraySegment<byte> buffer, System.Net.EndPoint remoteEndPoint) { throw null; }
         public System.Threading.Tasks.Task<System.Net.Sockets.SocketReceiveMessageFromResult> ReceiveMessageFromAsync(System.ArraySegment<byte> buffer, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint remoteEndPoint) { throw null; }
-        public System.Threading.Tasks.ValueTask<System.Net.Sockets.SocketReceiveMessageFromResult> ReceiveMessageFromAsync(System.Memory<byte> buffer, System.Net.EndPoint remoteEndPoint, System.Threading.CancellationToken cancellationToken = default) { throw null; }
-        public System.Threading.Tasks.ValueTask<System.Net.Sockets.SocketReceiveMessageFromResult> ReceiveMessageFromAsync(System.Memory<byte> buffer, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint remoteEndPoint, System.Threading.CancellationToken cancellationToken = default) { throw null; }
+        public System.Threading.Tasks.ValueTask<System.Net.Sockets.SocketReceiveMessageFromResult> ReceiveMessageFromAsync(System.Memory<byte> buffer, System.Net.EndPoint remoteEndPoint, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public System.Threading.Tasks.ValueTask<System.Net.Sockets.SocketReceiveMessageFromResult> ReceiveMessageFromAsync(System.Memory<byte> buffer, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint remoteEndPoint, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public bool ReceiveMessageFromAsync(System.Net.Sockets.SocketAsyncEventArgs e) { throw null; }
         public static void Select(System.Collections.IList? checkRead, System.Collections.IList? checkWrite, System.Collections.IList? checkError, int microSeconds) { }
         public static void Select(System.Collections.IList? checkRead, System.Collections.IList? checkWrite, System.Collections.IList? checkError, System.TimeSpan timeout) { }
@@ -426,9 +427,9 @@ public static void Select(System.Collections.IList? checkRead, System.Collection
         public System.Threading.Tasks.Task<int> SendAsync(System.ArraySegment<byte> buffer, System.Net.Sockets.SocketFlags socketFlags) { throw null; }
         public System.Threading.Tasks.Task<int> SendAsync(System.Collections.Generic.IList<System.ArraySegment<byte>> buffers) { throw null; }
         public System.Threading.Tasks.Task<int> SendAsync(System.Collections.Generic.IList<System.ArraySegment<byte>> buffers, System.Net.Sockets.SocketFlags socketFlags) { throw null; }
-        public System.Threading.Tasks.ValueTask<int> SendAsync(System.ReadOnlyMemory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
-        public System.Threading.Tasks.ValueTask<int> SendAsync(System.ReadOnlyMemory<byte> buffer, System.Net.Sockets.SocketFlags socketFlags, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public bool SendAsync(System.Net.Sockets.SocketAsyncEventArgs e) { throw null; }
+        public System.Threading.Tasks.ValueTask<int> SendAsync(System.ReadOnlyMemory<byte> buffer, System.Net.Sockets.SocketFlags socketFlags, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public System.Threading.Tasks.ValueTask<int> SendAsync(System.ReadOnlyMemory<byte> buffer, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public void SendFile(string? fileName) { }
         public void SendFile(string? fileName, byte[]? preBuffer, byte[]? postBuffer, System.Net.Sockets.TransmitFileOptions flags) { }
         public void SendFile(string? fileName, System.ReadOnlySpan<byte> preBuffer, System.ReadOnlySpan<byte> postBuffer, System.Net.Sockets.TransmitFileOptions flags) { }
@@ -443,9 +444,9 @@ public void SendFile(string? fileName, System.ReadOnlySpan<byte> preBuffer, Syst
         public int SendTo(System.ReadOnlySpan<byte> buffer, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint remoteEP) { throw null; }
         public System.Threading.Tasks.Task<int> SendToAsync(System.ArraySegment<byte> buffer, System.Net.EndPoint remoteEP) { throw null; }
         public System.Threading.Tasks.Task<int> SendToAsync(System.ArraySegment<byte> buffer, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint remoteEP) { throw null; }
+        public bool SendToAsync(System.Net.Sockets.SocketAsyncEventArgs e) { throw null; }
         public System.Threading.Tasks.ValueTask<int> SendToAsync(System.ReadOnlyMemory<byte> buffer, System.Net.EndPoint remoteEP, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
         public System.Threading.Tasks.ValueTask<int> SendToAsync(System.ReadOnlyMemory<byte> buffer, System.Net.Sockets.SocketFlags socketFlags, System.Net.EndPoint remoteEP, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
-        public bool SendToAsync(System.Net.Sockets.SocketAsyncEventArgs e) { throw null; }
         [System.Runtime.Versioning.SupportedOSPlatformAttribute("windows")]
         public void SetIPProtectionLevel(System.Net.Sockets.IPProtectionLevel level) { }
         public void SetRawSocketOption(int optionLevel, int optionName, System.ReadOnlySpan<byte> optionValue) { }
@@ -525,8 +526,8 @@ public enum SocketInformationOptions
         NonBlocking = 1,
         Connected = 2,
         Listening = 4,
-        [System.ObsoleteAttribute("SocketInformationOptions.UseOnlyOverlappedIO has been deprecated and is not supported.")]
         [System.ComponentModel.EditorBrowsableAttribute(System.ComponentModel.EditorBrowsableState.Never)]
+        [System.ObsoleteAttribute("SocketInformationOptions.UseOnlyOverlappedIO has been deprecated and is not supported.")]
         UseOnlyOverlappedIO = 8,
     }
     public enum SocketOptionLevel
@@ -685,13 +686,13 @@ public void Connect(System.Net.IPAddress[] ipAddresses, int port) { }
         public void Connect(System.Net.IPEndPoint remoteEP) { }
         public void Connect(string hostname, int port) { }
         public System.Threading.Tasks.Task ConnectAsync(System.Net.IPAddress address, int port) { throw null; }
-        public System.Threading.Tasks.Task ConnectAsync(System.Net.IPAddress[] addresses, int port) { throw null; }
-        public System.Threading.Tasks.Task ConnectAsync(string host, int port) { throw null; }
-        public System.Threading.Tasks.Task ConnectAsync(System.Net.IPEndPoint remoteEP) { throw null; }
         public System.Threading.Tasks.ValueTask ConnectAsync(System.Net.IPAddress address, int port, System.Threading.CancellationToken cancellationToken) { throw null; }
+        public System.Threading.Tasks.Task ConnectAsync(System.Net.IPAddress[] addresses, int port) { throw null; }
         public System.Threading.Tasks.ValueTask ConnectAsync(System.Net.IPAddress[] addresses, int port, System.Threading.CancellationToken cancellationToken) { throw null; }
-        public System.Threading.Tasks.ValueTask ConnectAsync(string host, int port, System.Threading.CancellationToken cancellationToken) { throw null; }
+        public System.Threading.Tasks.Task ConnectAsync(System.Net.IPEndPoint remoteEP) { throw null; }
         public System.Threading.Tasks.ValueTask ConnectAsync(System.Net.IPEndPoint remoteEP, System.Threading.CancellationToken cancellationToken) { throw null; }
+        public System.Threading.Tasks.Task ConnectAsync(string host, int port) { throw null; }
+        public System.Threading.Tasks.ValueTask ConnectAsync(string host, int port, System.Threading.CancellationToken cancellationToken) { throw null; }
         public void Dispose() { }
         protected virtual void Dispose(bool disposing) { }
         public void EndConnect(System.IAsyncResult asyncResult) { }
@@ -779,17 +780,17 @@ public void JoinMulticastGroup(System.Net.IPAddress multicastAddr, System.Net.IP
         public System.Threading.Tasks.Task<System.Net.Sockets.UdpReceiveResult> ReceiveAsync() { throw null; }
         public System.Threading.Tasks.ValueTask<System.Net.Sockets.UdpReceiveResult> ReceiveAsync(System.Threading.CancellationToken cancellationToken) { throw null; }
         public int Send(byte[] dgram, int bytes) { throw null; }
-        public int Send(System.ReadOnlySpan<byte> datagram) {throw null; }
         public int Send(byte[] dgram, int bytes, System.Net.IPEndPoint? endPoint) { throw null; }
-        public int Send(System.ReadOnlySpan<byte> datagram, System.Net.IPEndPoint? endPoint) { throw null; }
         public int Send(byte[] dgram, int bytes, string? hostname, int port) { throw null; }
+        public int Send(System.ReadOnlySpan<byte> datagram) { throw null; }
+        public int Send(System.ReadOnlySpan<byte> datagram, System.Net.IPEndPoint? endPoint) { throw null; }
         public int Send(System.ReadOnlySpan<byte> datagram, string? hostname, int port) { throw null; }
         public System.Threading.Tasks.Task<int> SendAsync(byte[] datagram, int bytes) { throw null; }
-        public System.Threading.Tasks.ValueTask<int> SendAsync(System.ReadOnlyMemory<byte> datagram, System.Threading.CancellationToken cancellationToken = default)  { throw null; }
         public System.Threading.Tasks.Task<int> SendAsync(byte[] datagram, int bytes, System.Net.IPEndPoint? endPoint) { throw null; }
-        public System.Threading.Tasks.ValueTask<int> SendAsync(System.ReadOnlyMemory<byte> datagram, System.Net.IPEndPoint? endPoint, System.Threading.CancellationToken cancellationToken = default) { throw null; }
         public System.Threading.Tasks.Task<int> SendAsync(byte[] datagram, int bytes, string? hostname, int port) { throw null; }
-        public System.Threading.Tasks.ValueTask<int> SendAsync(System.ReadOnlyMemory<byte> datagram, string? hostname, int port, System.Threading.CancellationToken cancellationToken = default)  { throw null; }
+        public System.Threading.Tasks.ValueTask<int> SendAsync(System.ReadOnlyMemory<byte> datagram, System.Net.IPEndPoint? endPoint, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public System.Threading.Tasks.ValueTask<int> SendAsync(System.ReadOnlyMemory<byte> datagram, string? hostname, int port, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
+        public System.Threading.Tasks.ValueTask<int> SendAsync(System.ReadOnlyMemory<byte> datagram, System.Threading.CancellationToken cancellationToken = default(System.Threading.CancellationToken)) { throw null; }
     }
     public partial struct UdpReceiveResult : System.IEquatable<System.Net.Sockets.UdpReceiveResult>
     {
@@ -799,7 +800,7 @@ public partial struct UdpReceiveResult : System.IEquatable<System.Net.Sockets.Ud
         public byte[] Buffer { get { throw null; } }
         public System.Net.IPEndPoint RemoteEndPoint { get { throw null; } }
         public bool Equals(System.Net.Sockets.UdpReceiveResult other) { throw null; }
-        public override bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhen(true)] object? obj) { throw null; }
+        public override bool Equals([System.Diagnostics.CodeAnalysis.NotNullWhenAttribute(true)] object? obj) { throw null; }
         public override int GetHashCode() { throw null; }
         public static bool operator ==(System.Net.Sockets.UdpReceiveResult left, System.Net.Sockets.UdpReceiveResult right) { throw null; }
         public static bool operator !=(System.Net.Sockets.UdpReceiveResult left, System.Net.Sockets.UdpReceiveResult right) { throw null; }
@@ -807,5 +808,9 @@ public partial struct UdpReceiveResult : System.IEquatable<System.Net.Sockets.Ud
     public sealed partial class UnixDomainSocketEndPoint : System.Net.EndPoint
     {
         public UnixDomainSocketEndPoint(string path) { }
+        public override System.Net.Sockets.AddressFamily AddressFamily { get { throw null; } }
+        public override System.Net.EndPoint Create(System.Net.SocketAddress socketAddress) { throw null; }
+        public override System.Net.SocketAddress Serialize() { throw null; }
+        public override string ToString() { throw null; }
     }
 }
diff --git a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/NetworkStream.cs b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/NetworkStream.cs
index 23b2883a702fc1..33d4fb975a2e75 100644
--- a/src/libraries/System.Net.Sockets/src/System/Net/Sockets/NetworkStream.cs
+++ b/src/libraries/System.Net.Sockets/src/System/Net/Sockets/NetworkStream.cs
@@ -541,7 +541,7 @@ public override Task<int> ReadAsync(byte[] buffer, int offset, int count, Cancel
             }
         }
 
-        public override ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken)
+        public override ValueTask<int> ReadAsync(Memory<byte> buffer, CancellationToken cancellationToken = default)
         {
             bool canRead = CanRead; // Prevent race with Dispose.
             ThrowIfDisposed();
@@ -601,7 +601,7 @@ public override Task WriteAsync(byte[] buffer, int offset, int count, Cancellati
             }
         }
 
-        public override ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken)
+        public override ValueTask WriteAsync(ReadOnlyMemory<byte> buffer, CancellationToken cancellationToken = default)
         {
             bool canWrite = CanWrite; // Prevent race with Dispose.
             ThrowIfDisposed();