Client-Server connection over internet with both client and server behind a router

[MoHammaD_93]

I'm attempting to establish a connection between two computers over the internet using winsocket2 library. Both the client and the server are behind a router.

What do I need for the connection to succeed? do both the client and server need to use port-forwarding?


EDIT:
To be more specific, I want to use the following codes for the server and client from MSDN:
Client: http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx
Server: http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx

[MoHammaD_93]

People! I need help.
Could somebody knowledgeable in this subject help by discussing the issue actively on e.g. skype or any messenger? I'd really appreciate that.

[2kaud]

What port are you using? What IP address are you using? Have the router/firewalls been configured to allow access for this port to/from the used IP address? How are you specifying the names/addresses of the computers to use?