I have set up iChat with different accounts: Facebook Jabber, Google Jabber, iCloud and an AIM account coming from MobileMe.
My AIM account regularly stops working where Messages will indefinitely get stuck at "Connecting...". I only experience this with my AIM account, the other accounts work fine. I also only started experiencing these problems since Mountain Lion.
Toggling the account back and forth to offline or quitting and relaunching Messages does not solve the problem, I need to completely remove the AIM account and reconfigure it.
Is there any way to solve my problem?