diff --git a/pkg/Microsoft.Private.PackageBaseline/packageIndex.json b/pkg/Microsoft.Private.PackageBaseline/packageIndex.json
index 160b5b7d7a2e..230478e9cec8 100644
--- a/pkg/Microsoft.Private.PackageBaseline/packageIndex.json
+++ b/pkg/Microsoft.Private.PackageBaseline/packageIndex.json
@@ -1343,7 +1343,8 @@
       "BaselineVersion": "4.0.0",
       "AssemblyVersionInPackageVersion": {
         "4.0.0.0": "4.0.0",
-        "4.0.1.0": "4.0.1"
+        "4.0.1.0": "4.0.1",
+        "4.1.0.0": "4.3.0"
       }
     },
     "System.Net.Sockets": {
diff --git a/src/System.Net.Security/dir.props b/src/System.Net.Security/dir.props
index 38aaf93ed7aa..0769c12aaa28 100644
--- a/src/System.Net.Security/dir.props
+++ b/src/System.Net.Security/dir.props
@@ -1,7 +1,7 @@
 <Project ToolsVersion="12.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
   <Import Project="..\dir.props" />
   <PropertyGroup>
-    <AssemblyVersion>4.0.1.0</AssemblyVersion>
+    <AssemblyVersion>4.1.0.0</AssemblyVersion>
   </PropertyGroup>
 </Project>
 
diff --git a/src/System.Net.Security/pkg/System.Net.Security.pkgproj b/src/System.Net.Security/pkg/System.Net.Security.pkgproj
index 7455d08ae7b7..c616146c50f2 100644
--- a/src/System.Net.Security/pkg/System.Net.Security.pkgproj
+++ b/src/System.Net.Security/pkg/System.Net.Security.pkgproj
@@ -3,7 +3,7 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
   <ItemGroup>
     <ProjectReference Include="..\ref\System.Net.Security.csproj">
-      <SupportedFramework>net46;netcoreapp1.0;$(AllXamarinFrameworks)</SupportedFramework>
+      <SupportedFramework>netcoreapp1.1</SupportedFramework>
     </ProjectReference>
     <ProjectReference Include="..\src\System.Net.Security.builds" />
   </ItemGroup>
diff --git a/src/System.Net.Security/ref/System.Net.Security.cs b/src/System.Net.Security/ref/System.Net.Security.cs
index 197843a9663a..ea94a028ec94 100644
--- a/src/System.Net.Security/ref/System.Net.Security.cs
+++ b/src/System.Net.Security/ref/System.Net.Security.cs
@@ -107,6 +107,7 @@ public override void Flush() { }
         public override int Read(byte[] buffer, int offset, int count) { return default(int); }
         public override long Seek(long offset, System.IO.SeekOrigin origin) { return default(long); }
         public override void SetLength(long value) { }
+        public virtual System.Threading.Tasks.Task ShutdownAsync() { return default(System.Threading.Tasks.Task); }
         public void Write(byte[] buffer) { }
         public override void Write(byte[] buffer, int offset, int count) { }
     }
diff --git a/src/System.Net.Security/ref/System.Net.Security.csproj b/src/System.Net.Security/ref/System.Net.Security.csproj
index 76a87b281019..91d6b82635cb 100644
--- a/src/System.Net.Security/ref/System.Net.Security.csproj
+++ b/src/System.Net.Security/ref/System.Net.Security.csproj
@@ -3,7 +3,8 @@
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.props))\dir.props" />
   <PropertyGroup>
     <OutputType>Library</OutputType>
-    <NuGetTargetMoniker>.NETStandard,Version=v1.3</NuGetTargetMoniker>
+    <PackageTargetFramework Condition="'$(TargetGroup)' == ''">netcoreapp1.1</PackageTargetFramework>
+    <NuGetTargetMoniker>.NETStandard,Version=v1.6</NuGetTargetMoniker>
   </PropertyGroup>
   <ItemGroup>
     <Compile Include="System.Net.Security.cs" />
diff --git a/src/System.Net.Security/ref/project.json b/src/System.Net.Security/ref/project.json
index 2a93773c4201..dda4cfaff6c2 100644
--- a/src/System.Net.Security/ref/project.json
+++ b/src/System.Net.Security/ref/project.json
@@ -9,9 +9,9 @@
     "System.Threading.Tasks": "4.0.0"
   },
   "frameworks": {
-    "netstandard1.3": {
+    "netstandard1.6": {
       "imports": [
-        "dotnet5.4"
+        "dotnet5.5"
       ]
     }
   }
diff --git a/src/System.Net.Security/src/System.Net.Security.builds b/src/System.Net.Security/src/System.Net.Security.builds
index 589eec12331e..a2e4c64acb40 100644
--- a/src/System.Net.Security/src/System.Net.Security.builds
+++ b/src/System.Net.Security/src/System.Net.Security.builds
@@ -8,9 +8,6 @@
     <Project Include="System.Net.Security.csproj">
       <OSGroup>Windows_NT</OSGroup>
     </Project>
-    <Project Include="System.Net.Security.csproj">
-      <TargetGroup>net46</TargetGroup>
-    </Project>
   </ItemGroup>
   <Import Project="$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildThisFileDirectory), dir.traversal.targets))\dir.traversal.targets" />
 </Project>
diff --git a/src/System.Net.Security/src/System.Net.Security.csproj b/src/System.Net.Security/src/System.Net.Security.csproj
index c80a0ebd0ca5..1fa1fe3da488 100644
--- a/src/System.Net.Security/src/System.Net.Security.csproj
+++ b/src/System.Net.Security/src/System.Net.Security.csproj
@@ -9,10 +9,7 @@
     <ProjectGuid>{89F37791-6254-4D60-AB96-ACD3CCA0E771}</ProjectGuid>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <DefineConstants>$(DefineConstants);FEATURE_CORECLR</DefineConstants>
-    <IsPartialFacadeAssembly Condition="'$(TargetGroup)' == 'net46'">true</IsPartialFacadeAssembly>
-    <ResourcesSourceOutputDirectory Condition="'$(TargetGroup)' == 'net46'">None</ResourcesSourceOutputDirectory>
-    <NuGetTargetMoniker Condition="'$(TargetGroup)' == ''">.NETStandard,Version=v1.3</NuGetTargetMoniker>
-    <NuGetTargetMoniker Condition="'$(TargetsUnix)' == 'true'">.NETStandard,Version=v1.6</NuGetTargetMoniker>
+    <NuGetTargetMoniker Condition="'$(TargetGroup)' == ''">.NETStandard,Version=v1.6</NuGetTargetMoniker>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(TargetsWindows)' == 'true' and '$(ProjectJson)' == '' ">
     <ProjectJson>win/project.json</ProjectJson>
diff --git a/src/System.Net.Security/src/System/Net/SecureProtocols/SslStream.cs b/src/System.Net.Security/src/System/Net/SecureProtocols/SslStream.cs
index 69ce0ae1dd1d..0a9169052363 100644
--- a/src/System.Net.Security/src/System/Net/SecureProtocols/SslStream.cs
+++ b/src/System.Net.Security/src/System/Net/SecureProtocols/SslStream.cs
@@ -189,6 +189,12 @@ public virtual Task AuthenticateAsServerAsync(X509Certificate serverCertificate,
 
             return Task.Factory.FromAsync((callback, state) => BeginAuthenticateAsServer(serverCertificate, clientCertificateRequired, enabledSslProtocols, checkCertificateRevocation, callback, state), EndAuthenticateAsServer, null);
         }
+
+        public virtual Task ShutdownAsync() 
+        { 
+            throw new PlatformNotSupportedException(); 
+        }
+
         #endregion
 
         public override bool IsAuthenticated
diff --git a/src/System.Net.Security/src/win/project.json b/src/System.Net.Security/src/win/project.json
index 539a1917e499..a59bb39bdf07 100644
--- a/src/System.Net.Security/src/win/project.json
+++ b/src/System.Net.Security/src/win/project.json
@@ -1,8 +1,8 @@
 {
   "frameworks": {
-    "netstandard1.3": {
+    "netstandard1.6": {
       "imports": [
-        "dotnet5.4"
+        "dotnet5.5"
       ],
       "dependencies": {
         "Microsoft.NETCore.Platforms": "1.0.1",
@@ -24,11 +24,6 @@
         "System.Threading.Tasks": "4.0.10",
         "System.Threading.ThreadPool": "4.0.10"
       }
-    },
-    "net46": {
-      "dependencies": {
-        "Microsoft.TargetingPack.NETFramework.v4.6": "1.0.1"
-      }
     }
   }
 }
diff --git a/src/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj b/src/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj
index 4142e53df14d..1f9b119d771a 100644
--- a/src/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj
+++ b/src/System.Net.Security/tests/FunctionalTests/System.Net.Security.Tests.csproj
@@ -9,7 +9,9 @@
     <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
     <ProjectGuid>{A55A2B9A-830F-4330-A0E7-02A9FB30ABD2}</ProjectGuid>
     <OutputType>Library</OutputType>
-    <NugetTargetMoniker>.NETStandard,Version=v1.3</NugetTargetMoniker>
+    <NuGetTargetMoniker>.NETCoreApp,Version=v1.1</NuGetTargetMoniker>
+    <!-- <NugetTargetMoniker>.NETStandard,Version=v1.3</NugetTargetMoniker> -->
+    <!-- <NugetTargetMoniker>.NETStandard,Version=v1.6</NugetTargetMoniker>-->
   </PropertyGroup>
   <PropertyGroup Condition=" '$(TargetsUnix)' == 'true' ">
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
diff --git a/src/System.Net.Security/tests/FunctionalTests/unix/project.json b/src/System.Net.Security/tests/FunctionalTests/unix/project.json
index a608754f39ec..87ca2540bbff 100644
--- a/src/System.Net.Security/tests/FunctionalTests/unix/project.json
+++ b/src/System.Net.Security/tests/FunctionalTests/unix/project.json
@@ -29,13 +29,9 @@
     "Microsoft.DotNet.BuildTools.TestSuite": "1.0.0-prerelease-00731-01"
   },
   "frameworks": {
-    "netstandard1.3": {}
+    "netstandard1.6": {}
   },
   "supports": {
-    "coreFx.Test.netcoreapp1.0": {},
-    "coreFx.Test.net46": {},
-    "coreFx.Test.net461": {},
-    "coreFx.Test.net462": {},
-    "coreFx.Test.net463": {}
+    "coreFx.Test.netcoreapp1.1": {}
   }
 }
diff --git a/src/System.Net.Security/tests/FunctionalTests/win/project.json b/src/System.Net.Security/tests/FunctionalTests/win/project.json
index 3caa1226327a..c050ee327ec3 100644
--- a/src/System.Net.Security/tests/FunctionalTests/win/project.json
+++ b/src/System.Net.Security/tests/FunctionalTests/win/project.json
@@ -24,14 +24,7 @@
     "Microsoft.xunit.netcore.extensions": "1.0.0-prerelease-00731-01",
     "Microsoft.DotNet.BuildTools.TestSuite": "1.0.0-prerelease-00731-01"
   },
-  "frameworks": {
-    "netstandard1.3": {}
-  },
   "supports": {
-    "coreFx.Test.netcoreapp1.0": {},
-    "coreFx.Test.net46": {},
-    "coreFx.Test.net461": {},
-    "coreFx.Test.net462": {},
-    "coreFx.Test.net463": {}
+    "coreFx.Test.netcoreapp1.1": {}
   }
 }