Simply close/dispose socket.

src/Renci.SshNet.Tests/Classes/ForwardedPortDynamicTest_Started_SocketVersionNotSupported.cs

@@ -40,12 +40,8 @@ namespace Renci.SshNet.Tests.Classes
             }
             if (_client != null)
             {
-                if (_client.Connected)
-                {
-                    _client.Shutdown(SocketShutdown.Both);
-                    _client.Close();
-                    _client = null;
-                }
+                _client.Close();
+                _client = null;
             }
         }
 

src/Renci.SshNet.VS2015.sln.DotSettings

@@ -9,4 +9,5 @@
 	<s:String x:Key="/Default/CodeInspection/Highlighting/InspectionSeverities/=UseNullPropagation/@EntryIndexedValue">DO_NOT_SHOW</s:String>
 	<s:String x:Key="/Default/CodeInspection/Highlighting/InspectionSeverities/=UseStringInterpolation/@EntryIndexedValue">DO_NOT_SHOW</s:String>
 	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=HMACMD/@EntryIndexedValue">HMACMD</s:String>
-	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=HMACSHA/@EntryIndexedValue">HMACSHA</s:String></wpf:ResourceDictionary>
+	<s:String x:Key="/Default/CodeStyle/Naming/CSharpNaming/Abbreviations/=HMACSHA/@EntryIndexedValue">HMACSHA</s:String>
+	<s:String x:Key="/Default/Environment/UnitTesting/ExcludedCategoriesList/@EntryValue">integration,LongRunning</s:String></wpf:ResourceDictionary>