From: Craig Paterson (craigptippett.com)
Date: Tue Apr 13 2004 - 16:21:17 CDT

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Remko Lodder wrote:

> Harper, Patrick wrote:
>
> Use a proxy and only allow 80/443 and 21/20 ???
>
>>
>> Does anyone have an effective way of blocking chat/IM?
>> Krisa Rowland ERDC Information Assurance Team
>

That alone won't do it -- most of the IM systems are smart enough to
tunnel on port 80 if they can't get out another way. You'll also need to
block the login servers, which is a moving target but (depending on how
tight your requirement) does a pretty good job of breaking IM for LAN
users without a huge time investment.

Craig.

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