Connecting via college/university sounds like the issue. Most schools block or shape p2p programs or bandwidth or ports nowadays.

Else, if you are connecting from home, I am aware such radio frequency sent services generally are not good for p2p use. They will have their own set of routers that block ports. You would need to requeset them to open some ports for you.

Port 6346 is the default port used for Gnutella network, however any high number port can be used. You could try a port or several in the range of 49152 - 65535. A good one to try is port 64049. Others to try that might be open for other purposes are: 80, 443, 427, 1111, 1203, 3500, 4008, 10000, 19515, 25079. Check the Phex Network options to change port.