I have written a simple network program on java using sockets. Program has a client and a server.

When user types a word on client side, server simply return this word to client.

On server side I use Serversocket and bind it to port 4444. Why does not firewall block this connection on my server PC?

I ask this question because earlier I wrote this program using corba technology, and firewall on my server PC was blocking the connection to this port; when I disabled the firewall the program worked fine.