RE: AOL, Yahoo, and Instant Messaging

["Noller, Gregory" <Noller2G () kochind com>]

We've found that Yahoo Messenger does not play nice with proxy servers, and
our internal customers require YM.

We had to tell our firewall to allow outbound YM and tell our MS Proxy
servers to fwd YM to the firewall.

Greg

        [Noller, Gregory]  <snip>
         
> basis. Yahoo! Messenger can be blocked in a similar way, by killing off
> outbound access to the hosts answering to the following names:
> msg.edit.yahoo.com
> edit.messenger.yahoo.com
> csa.yahoo.com
> csb.yahoo.com
> csc.yahoo.com
>
> Each of the above names resolves out to multiple IP addresses-and, of
> course, Yahoo! can add new addresses at any time, making it an ongoing
> battle.

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