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Block messengers on the network

By salehd ·
Hi all;
I want to ban all users in my network from using messenger.
The easiest way I can think of is to block messengers ports at the router with connect the network to internet? But can anyone please tell me what ports should I block for MSN and yahoo messengers? Thanks

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by TheChas In reply to Block messengers on the n ...

Here is one site that list most of the ports and what services use them:

http://www.glocksoft.com/trojan_port.htm

Here are a few links from an old TR article titled "Block those ports!"

http://www.iana.org/assignments/port-numbers

http://www.chebucto.ns.ca/~rakerman/port-table.html

http://tinyurl.com/3e77j

Remove any spaces from the pasted links.

Chas

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by salehd In reply to

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by Oldefar In reply to Block messengers on the n ...

Easiest way? I don't know about that. Yahoo will search for an open port, so you might find yourself constantly checking, blocking, and checking again forever.

Consider a different approach. Users on the network have determined a need to use messenger. If you meet that need, they won't be bothering with bringing in their own solutions. Most user work arounds exist only because IT has placed some barrier to their work that needs to be worked around. Meeting the need keeps you in the loop to match security requirements with business requirements, and makes you a partner instead of an advisary.

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by Oldefar In reply to

The chebucto site recommended by Chas is pretty good. Just remember to bookmark it since, as the site author states, "It seems like every day there is a new Internet service that uses some new set of poorly-documented, unregistered ports."

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by salehd In reply to Block messengers on the n ...

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