Because it seems lately I am more a babysitter for users than a network admin, we have had some new employees abuse the google gmail chat feature. We also use Google Apps, but I had already disabled chat through the settings interface for the domain.
Unfortunately these users were logging in to their personal gmail accounts to chat it up. Google will give you the answer you want at the following URL: http://www.google.com/support/chat/bin/answer.py?answer=161980 which will tell you to:
- To block Gmail chat: chatenabled.mail.google.com
- To block iGoogle and orkut chat: talkgadget.google.com
- To block the Google Talk client and other desktop clients: talk.google.com and talkx.l.google.com
So I plugged this into my router web content filter and it worked, except it leaves a little help link to a help article that tells you to login through a secured connection https:. For some reason my router would not block that, so I went in to my DNS servers and created a primary zone for chatenabled.mail.google.com and pointed it to 127.0.0.1 and jsut like that it was blocked for both http & https.
Next up…. Yahoo Chat!