Instant Messaging Woes

[WK]

I read it from newsgroup a while back ago, but never done it ...

To block msn, icq, yahoo, simply block the logon server the instant 
messenger client is connecting to.

To log instant messenger chat log, take a look at msgsnarf (a tool comes 
with dsniff).

Wil McGilvery wrote:

> Some of the IM clients use port 80 when their other port is blocked. I know MSN does this. The only way to block this is to start using an application proxy.
> 
> I may not be able to control who they chat with, but it would nice to have log files for reference.
> 
> Regards,
> 
> Wil McGilvery
> Manager
> Lynch Digital Media Inc
> 
>          
> 
> 416-744-7949
> 416-716-3964 (cell)
> 1-866-314-4678
> 416-744-0406  FAX
> www.LynchDigital.com
> 
> -----Original Message-----
> From: owner-tlug-lxSQFCZeNF4 at public.gmane.org [mailto:owner-tlug-lxSQFCZeNF4 at public.gmane.org] On Behalf Of Kevin Cozens
> Sent: Monday, August 09, 2004 1:01 PM
> To: tlug-lxSQFCZeNF4 at public.gmane.org
> Subject: Re: [TLUG]: Instant Messaging Woes
> 
> At 10:49 AM 08/09/2004, Wil McGilvery wrote:
> 
>>I am now in the position of having to regulate Instant Message clients in 
>>our Network. Does anyone have experience with this?
> 
> [snip]
> 
>>I would like to:
>>
>>Use an internal IM system for staff to use.
>>Allow certain employees to connect to the outside world.
>>Keep track of who they connect to.
> 
> [snip]
> 
>>I don't want to shutdown the Instant Message clients completely. Currently 
>>the client of choice is MSN.
> 
> 
> I don't know how easy it would be to keep track of who someone is chatting 
> with via an IM client. As for controlling it, the first step would be in 
> identifying the port(s) used by the client. In the case of ICQ, it used 
> port 4000 (IIRC). With that program, you could control use of it by adding 
> rules to your firewall related to the use of port 4000.
> 
> 
> Cheers!
> 
> Kevin.  (http://www.interlog.com/~kcozens/)
> 
> Owner of Elecraft K2 #2172        |"What are we going to do today, Borg?"
> E-mail:kcozens at interlog dot com|"Same thing we always do, Pinkutus:
> Packet:ve3syb at ve3yra.#con.on.ca.na|  Try to assimilate the world!"
> #include <disclaimer/favourite>   |              -Pinkutus & the Borg
> 
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