Port defaulted to that...but it is still showing it as offline...I will post all the connection details in a min.
Address: irc.mibbit.com
Port: 6667
Password: optional (not there)
Encoding: UTF-8
SSL: on ?
I believe it is irc.mibbit.net , but either seems to work.
For SSL though, try port 6697.
If not using SSL, then use port 6667.
Let us know if that helps.
Which client are you trying out?