Unity freezes when I try to connect to the web socket server

I've just started working with websocket-sharp and Unity, I created client and server applications to test it in the same machine. Everything works fine using localhost as local address. Then, I tried to run the server and the client from different machines. Client calls the server with ws://192.168.1.x:8080/something but once I try to play the client from the Unity Editor or from the built app, it freezes for 10-20 seconds but it cannot connect. Currently I'm running the server on a Windows machine and the client on a MacbookPro. If I try to use explicitly an IP address in the same machine for both client and server apps, but I cannot connect. Any ideas?

No file, test, or entry point is named. Start by reproducing the Unity client and websocket-sharp server across the Windows and MacBook setup using the reported ws://192.168.1.x:8080/something address, then inspect where the connection waits or times out. Done means the client connects across machines without freezing.