Blocking messenger

Hi

I have been asked to stop staff using MSN messenger. I believe the easiest way to do this is to block access to https://login.passport.com therefore stopping anyone to log on. (dont want to start blocking ports)

I guess I would add this address somewhere to our firewall (the person in charge of our firewall has just left !) any ideas how I can do this.

Ian

Whats your firewall name,
what distro,...
Please provide as much info as possible

Firewall is the one that comes with Red Hat linux 7.2
Kernel 2.4.7-10

Ian

Im not a pro at setting firewall under linux, but here's something that might work

Get IPTABLES working.

Code:

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iptables -A OUTPUT -p tcp -d messenger.hotmal.com --dport 1863 -j REJECT

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This can block an ip or range of ips:

Code:

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iptables -A OUTPUT -p tcp -s address/mask -d messenger.hotmal.com --dport
1863 -j REJECT

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also if a real security admin could have a look at this, there may be a flaw in this...