Re: Please help...

From: NeoSadist (neos@dist)
Date: 11/19/02 

From: "NeoSadist" <neos@dist>
Date: Tue, 19 Nov 2002 04:35:24 -0700

"Dano Tang" <dtang@macaucabletv.com> wrote in message
news:arcpkn$mab1@ctmsun0.macau.ctm.net...
> Dear all,
>
> Can anyone direct me how to solve to block the following 2 services within
> my network? I am currently using CheckPoint 4.1
>
> 1. Microsoft MSN Messenger
> 2. Yahoo Messenger
>
>
> Thanks in advanced!!
>
> Regards,
> Dano
>
>

First off, if people on your network are installing these things without
permission, let their boss know that their employees are compromising the
security of the company. Try to get a policy written that those employees
that install ANY software without your permission in writing will be fined /
punished / fired. Who runs the network? You or them? Who is going to be
in trouble if it all goes down? You.
But anyways, I'd block msnp port (port 1863) for msn messenger. Also, I'd
block port 23, since that will prevent them from downloading it and
installing it in the first place.
Then, I'd watch the logs (since I don't know the specific yahoo ports) and
find out what ports are hitting yahoo alot, and which ports are being used
to sign into hotmail and passport, which will enable you to block those
sites or those ports, one or the other.

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