I'm using Google Apps with my own domain name. But the account is not usable with iChat for Google Talk with this error.
"iChar can't log in to talk.google.com because your login ID or password is incorrect."
Of course, I tried several time with correct password. I can sure my password is correct because I could log into my Apps service with same password.
Does any additional configuration required on server or client to use iChat as XMPP client for Google Talk with Google Apps account?
Currently, all client configurations are default, and I don't know about server configuration.