Compiling source under 64-bit with G++

I successfully built a source which was originally made for 32-bit under 64-bit.

The operating system I use is FreeBSD 9.2 64-bit. To build the source I used G++ 4.8 using C++11 ( -std=c++11 flag ) and libc++ (for some reason I needed it).

As I said, I built it. I started it and it's running quite good, but I have a problem: I can't connect to it. It's a game core and I can't connect to it using my game client.



My question is: is there something that I have to modify in order to work properly? It can be a socket problem?

I mention that I used an already-compiled source found on the internet and it's working. So it can't be firewall.