- make sure you have installed 2.60b http://et.trackbase.net/downloads/c4/
- in the ingameserverlist look that its set to internet, not local.
- is some firewall blocking your game? Software or Router.

can you connect to a server even without a list?
write in console

connect 123.123.123.123.27960

pick a ip out here http://et.trackbase.net/serverlist/