When iChat AV beta first came out, my brother in Boston and I in Baltimore would videoconference without problem. Both of us were using Jaguar at that time. Other than that, our Macs, routers, etc have not changed. Back then, I was using a firewire video cam for iChat. A few weeks ago, after not chatting for a long time (definitely not since upgrading to iChat 2.1), we tried to connect again and no luck. I figured that maybe Apple had dropped support for certain cameras with the new release of iChat, so I went out and bought an iSight. At this point, my brother and I are both using the latest version of iChat AV, both using iSights on G4s which meet the iChat specs, both running Panther, and we can't get it to work. No matter who initiates chat, we get a failure to respond message. I figure the problem is on my end since my brother is able to do video chat with other friends. I find it unlikely that this is related to my firewall since the iChat AV beta previously worked with the same router and firewall settings. Just to be sure I set my Mac as DMZ on my router configuration and disabled its software firewall. My bro did the same on his end. Still no luck . Anyone know what else I can try?