Exception!! Please Help!

java.net.ConnectException: Connection refused: connect

I do not know why I get this because I have done something very similer before.... I have made a connection with sockets to a machine other then localhost but this time it seems not to want to let me. Maybe I do not have the correct security permissions set. This happens when I connect to any computer then my own. Does anyone have any ideas?

[419 byte] By [Squall_CE] at [2007-9-26 2:15:36]