Assuming the instant messenger clients use standard ports/hostnames to
connect to, ipchains/iptables would be the appropriate tool to block the
clients when they use their own native protocols.

Some IM clients allow you to proxy through HTTP. I guess these would
take their route through squid, and the squidGuard - but assuming the
hostname is static (like. instantmessenging.domain.com), and
instantmessenging.domain.com doesn't hold a website it could be blocked
by ipchains/tables (although personally I would prefer to block this
through squidGuard).

Regards,
Adam

On Thu, 2002-06-13 at 19:15, Morris Maynard wrote:
> 1st, Chris, I'd rather you asked questions like this on the newsgroup. We
> all benefit from the questions, even if they aren't answered.
> 
> Squidguard can only block requests that are passed to it by squid. Thus,
> this is more of a squid question than a squidguard one. The answer is that
> IM protocols are very different from HTTP or FTP and so they are unlikely to
> work if redirected through squid.
> 
> -----Original Message-----
> From: Chris [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, June 13, 2002 11:58 AM
> To: [EMAIL PROTECTED]
> Subject: Blocking Instant messaging
> 
> 
> Hi Morris do you know how I can use squidGuard to block instant messaging
> services such as AOL instant messaging and MSN instant messaging ??
> 
> Thanks
> 
> Chris McDermott

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