Hi all,
I have developed server/client application (using C) and tested it on the same machine .. but when I deploy them on different machines I get connection timeout.

Well .. server machine and client machine exists on different network segments, so there is a linux firewall box to route traffic (all ports are open on it)

so my question is there anyway that client program can communicate with my server program via the firewall .. is there any function in C for this kind of setup

(I searched alot but didn't find anything useful .. so If it is not possible .. how come there exists so many server/client application that can communicate via firewalls)