Hi,
Depending on what is in the Error 8 log will point to what needs changing.
Starting with the Mac Firewall if ON the ports iChat uses need to be entered as there is no preset.
http://www.ralphjohnsuk.dsl.pipex.com/page4.html#_mactodo
In System Preferences > Quicktime > Streaming
It needs to be set to 1.5Mbps. (Automatic does not work properly and can sometimes be error 8)
In your router and modem the ports need to be opened or allowed.
If you do have separate devices they have to be configure properly.
(Cobbled together networks work for Web browsing and mail but iChat needs the LAN networked correctly - even then it can be fussy)
Your ISP may offer a VoIP service which means they may block ports.
Vonage type adapters also have to be placed in the right palce on your LAN (Not in line)
10:56 PM Wednesday; October 10, 2007