I have a network of Macintosh only machines connected behind a Mikrotik RB751G-2HnD. These group of people use iChat internally which works for chat but not for transferring files and/or video chat.
All machines have the firewall disabled. I have test with two machines connected to another router (linksys) and ichat does work correctly.
I have tried several firewall rules at the router with no luck.
Does anyone have any experience with it ? I search and google it with no luck.