diff --git a/src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/Managed/ManagedQuicConnection.cs b/src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/Managed/ManagedQuicConnection.cs
index badaf724f73819..5c7ae8957591dc 100644
--- a/src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/Managed/ManagedQuicConnection.cs
+++ b/src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/Managed/ManagedQuicConnection.cs
@@ -14,6 +14,7 @@
 using System.Net.Quic.Implementations.Managed.Internal.Streams;
 using System.Net.Quic.Implementations.Managed.Internal.Tracing;
 using System.Net.Quic.Implementations.Managed.Internal.Tls;
+using System.Net.Quic.Implementations.Managed.Internal.Tls.OpenSsl;
 using System.Net.Security;
 using System.Threading;
 using System.Threading.Tasks;
@@ -21,6 +22,8 @@
 using System.Threading.Channels;
 using System.Diagnostics.CodeAnalysis;
 
+#pragma warning disable IDE0060
+
 namespace System.Net.Quic.Implementations.Managed
 {
     public sealed partial class ManagedQuicConnection : IAsyncDisposable
@@ -69,6 +72,8 @@ public sealed partial class ManagedQuicConnection : IAsyncDisposable
         /// </summary>
         private bool IsClosing => _closingPeriodEndTimestamp != null;
 
+        private bool Connected => HandshakeConfirmed;
+
         /// <summary>
         ///     Timestamp when the connection close will be initiated due to lack of packets from peer.
         /// </summary>
@@ -607,7 +612,7 @@ internal ValueTask DisposeAsync(long errorCode)
             if (!Connected)
             {
                 // abandon connection attempt
-                _connectTcs.TryCompleteException(new QuicException(QuicError.ConnectionAborted, errorCode));
+                _connectTcs.TryCompleteException(new QuicException(QuicError.ConnectionAborted, errorCode, "Abandon connection attempt"));
                 _closeTcs.TryComplete();
                 return default;
             }
@@ -775,7 +780,7 @@ internal void ThrowIfError()
                 if (!_outboundError.IsQuicError)
                 {
                     // connection close initiated by application
-                    throw new QuicOperationAbortedException();
+                    throw new QuicException(QuicError.ConnectionAborted, (long)_outboundError.ErrorCode, "Connection close initiated by application");
                 }
                 else if (_outboundError.ErrorCode != TransportErrorCode.NoError)
                 {
@@ -893,12 +898,12 @@ private QuicException MakeOperationAbortedException()
         {
             return _inboundError != null
                 ? MakeConnectionAbortedException(_inboundError) // initiated by peer
-                : new QuicOperationAbortedException(); // initiated by us
+                : new QuicException(QuicError.OperationAborted, null, "Initiated by us");
         }
 
         private static QuicException MakeConnectionAbortedException(QuicTransportError error)
         {
-            return new QuicException(QuicError.ConnectionAborted, (long)error.ErrorCode, error.ReasonPhrase);
+            return new QuicException(QuicError.ConnectionAborted, (long)error.ErrorCode, error.ReasonPhrase ?? "");
         }
 
         internal void OnSocketContextException(Exception e)
@@ -924,3 +929,5 @@ internal void DoCleanup()
         }
     }
 }
+
+#pragma warning restore IDE0060
diff --git a/src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/Managed/ManagedQuicListener.cs b/src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/Managed/ManagedQuicListener.cs
index 710e7323bbc3f8..8d0dd840c205b3 100644
--- a/src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/Managed/ManagedQuicListener.cs
+++ b/src/libraries/System.Net.Quic/src/System/Net/Quic/Implementations/Managed/ManagedQuicListener.cs
@@ -5,6 +5,7 @@
 using System.Net.Quic.Implementations.Managed.Internal;
 using System.Net.Quic.Implementations.Managed.Internal.Sockets;
 using System.Net.Quic.Implementations.Managed.Internal.Tls;
+using System.Net.Quic.Implementations.Managed.Internal.Tls.OpenSsl;
 using System.Threading;
 using System.Threading.Channels;
 using System.Threading.Tasks;
@@ -51,11 +52,13 @@ public ValueTask<ManagedQuicConnection> AcceptConnectionAsync(CancellationToken
 
         public ValueTask DisposeAsync()
         {
-            if (_disposed) return;
-            
+            if (_disposed) return ValueTask.CompletedTask;
+
             _disposed = true;
 
             _socketContext.StopOrOrphan();
+
+            return ValueTask.CompletedTask;
         }
     }
 }