Windows XP firewall blocks open connection made using C# socket

I make a client-server connection using C# sockets and while the connection is es开发者_开发知识库tablished in the client side I activate the firewall using the firewall api, after that, for some reason the client application becomes unable to send any data to the server and the two parts still connected. Is like the activation of the firewall blocks the connection. Why is this happening? If more information is needed please just ask.

HEY you must go to the firewall's options and set the name of the applications that it doesn't have to block, or if you're creating a maliciuos thing you can do this though dos command line using NETSH.exe (look for netsh parameters on internet). if the problem isn't solved, please post the code and I'll correct it.