Connection refused when building with IL2CPP [Unity5.0]

I'm trying to convert our project to Unity 5.0, and I'm having problems with getting .NET sockets working. When I try to connect, I get a socket exception:

[TCPSocket] Error when trying to finish the connect on host localhost:8082 - System.Net.Sockets.SocketException: Connection refused
at System.Net.IPv6Address..ctor (System.UInt16[] addr, Int32 prefixLength) [0x00000] in <filename unknown>:0
at System.Net.Sockets.Socket+SocketAsyncResult.CheckIfThrowDelayedException () [0x00000] in <filename unknown>:0
at System.Net.Sockets.Socket.EndConnect (IAsyncResult result) [0x00000] in <filename unknown>:0
at System.Net.Sockets.TcpClient.EndConnect (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
at TripleFun.TCPSocket._onConnect (IAsyncResult ar) [0x00000] in <filename unknown>:0
at System.AsyncCallback.Invoke (IAsyncResult ar) [0x00000] in <filename unknown>:0
at GoogleGravity..ctor () [0x00000] in <filename unknown>:0
at System.Net.Sockets.Socket+SocketAsyncResult.Complete () [0x00000] in <filename unknown>:0
at System.Net.Sockets.Socket+SocketAsyncResult.Complete (System.Exception e) [0x00000] in <filename unknown>:0
at System.Net.Sockets.Socket+Worker.Connect () [0x00000] in <filename unknown>:0
at Replacements.MSCompatUnicodeTable.get_IsReady () [0x00000] in <filename unknown>:0

Sockets are working fine in 4.6.3 and if I build using Mono, so it seems to be a IL2CPP issue. Has anyone gotten this working?

 

If you didn't, try the Unity 5 patch releases.
http://unity3d.com/unity/qa/patch-releases

 

Is this happening with or without build stripping?

 

I got it working in the end - pretty dumb error - the host/port wasn't set properly when building on the device