First question I'm going to ask is: Does this happen just with one network or does it happen with many networks..Please note the word network versus server . Many networks (especially the bigger ones) have multiple servers.

If you've only tried one network, then try another (or more than one) and see if you can connect. If you've tried it with other networks, please include a list of some of the networks that you've tried it with, so that we can see if we have any problems connecting with that same network. Server names, if you have them, would also be appreciated, since we'd be able to specify the exact server(s) that you're having trouble with.