Keeping address family (fix for IPv6)

Author: RobertTheArchitect

Provider/src/FirebirdSql.Data.FirebirdClient/Client/Managed/GdsConnection.cs

@@ -115,7 +115,15 @@ public virtual void Connect()
 				IPAddress = GetIPAddress(_dataSource, AddressFamily.InterNetwork);
 				var endPoint = new IPEndPoint(IPAddress, _portNumber);
 
-				_socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+				//Changed by Robert Dickens @RobertTheArchitect on Oct-04-2017 as
+				//Existing code bellow will fail connection when attempting to remotly connect to a
+				//Remote Firebird installation via IPv6 protocol only
+				//_socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
+
+
+				//Address family being passed into Socket should reflect the AddressFamily of the IpAddress Object and not
+				//forced to InterNetwork creating a protocol conflict
+				_socket = new Socket(IPAddress.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
 
 				_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveBuffer, _packetSize);
 				_socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.SendBuffer, _packetSize);