As MSN chat is closing down slowly, the original server "gateway.messenger.hotmail.com" is no longer available and as such messagers like Trillian will fail to connect to the MSN chat network.
A simple solution is luckily available for now, simply change your MSN server address to :
bn1msgr1011204.gateway.edge.messenger.live.com
And it will work. For now.
Solution is also highlighted on the official Trillian forum:
http://help.trillian.im/kb/accounts/windows-live-msn-the-servers-protocol-did-not-match-our-requested-protocol
