Fix some safety connectivity issues regarding IInstance enumeration

TGS.Interface/Wrappers/IServer.cs

@@ -15,7 +15,7 @@ namespace TGS.Interface.Wrappers
 		new Version Version { get; }
 		
 		/// <summary>
-		/// Get the <see cref="IInstance"/>s the <see cref="IServer"/> contains that the current user can access
+		/// Get the <see cref="IInstance"/>s the <see cref="IServer"/> contains that the current user can access and connect to
 		/// </summary>
 		IEnumerable<IInstance> Instances { get; }
 

TGS.Interface/Wrappers/Instance.cs

@@ -24,6 +24,9 @@ namespace TGS.Interface.Wrappers
 		{
 			serverInterface = _serverInterface;
 			metadata = _metadata;
+			if (metadata.Enabled)
+				//run a connectivity check
+				serverInterface.GetComponent<ITGConnectivity>(metadata.Name).VerifyConnection();
 		}
 
 		/// <inheritdoc />

TGS.Interface/Wrappers/Server.cs

@@ -14,10 +14,21 @@ namespace TGS.Interface.Wrappers
 		public IEnumerable<IInstance> Instances { get
 			{
 				lock (this)
-					if(knownInstances == null)
+					if (knownInstances == null)
 						knownInstances = serverInterface.GetComponent<ITGLanding>(null).ListInstances();
-				foreach(var I in knownInstances)
-					yield return new Instance(serverInterface, I);
+				foreach (var I in knownInstances)
+				{
+					IInstance nextInstance;
+					try
+					{
+						nextInstance = new Instance(serverInterface, I);
+					}
+					catch
+					{
+						continue;
+					}
+					yield return nextInstance;
+				}
 			}
 		}