Currently Being ModeratedNov 11, 2012 1:25 PM (in response to TerryNN)
That is very odd.
When you login in to the AIM Servers this is done over the TCP Protocol on port 5190 in versions up to and including iChat 5.
When these versions switch to Direct IM (1-1 with Files or pics being sent) or Group chats then the chat moves to using the UDP Protocol still on port 5190.
For a long time there have been suggestions here to use port 443 for the login.
However the UDP traffic on port 5190 stays there (you cannot change this).
The Mac Firewall can be set not to allow UDP traffic but this would be incoming data so chat IMs would not show.
I notice that you mention you are on Messages.
This logs into AIM on port 443 as the default choice.
It still moves to port 5190 on UDP for a Group chat.
The same things about the Firewall would apply (it could block things but would more likely effect incoming data)
I am not sure what to suggest at this time.
Please, if posting Logs, do not post any Log info after the line "Binary Images for iChat"
iMac 2.5Ghz 5i 2011 (Mountain Lion 10.8.2)
G4/1GhzDual MDD (Leopard 10.5.8)
MacBookPro 2Gb (Snow Leopard 10.6.8)
Mac OS X (10.6.8),
Couple of iPhones and an iPad
"Limit the Logs to the Bits above Binary Images." No, Seriously