how i can block yahoo messenger in a small office network

dear sir
how i can block yahoo messenger in a small office network i have small office but i donot have server and i want to bock yahoo messenger in all computer in network
how i can do that
can i block all messenger
thanks
nasemabdullaAsked:
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gidds99Commented:
Do you have a router?  If so you can block these ports on the router to disbale Yahoo:

http://support.dlink.com/faq/view.asp?prod_id=1428

If not you should be able to filter these ports in the TCP/IP properties of the network connection. Like this:

http://homepages.wmich.edu/~mchugha/w2kfirewall.htm

Also there are several 3rd party tools which can block this (not free):

http://www.plevna.f9.co.uk/blockyahoomessenger.htm

Hope this helps.
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Jupiler78Commented:
Hi nasemabdulla,

block the ports that yahoo uses

Cheers!
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nasemabdullaAuthor Commented:
dear gidds99
can i use it in windows xp SP2 and how

thanks for your help
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gidds99Commented:
Can you use what in XP SP2?  I offered 3 different solutions to your problem.
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einsteinjr79Commented:
Try ussing ipsec also.
The best is to use block the ports on the router as suggested by gidds99

gidds99>> I think he meant firewall of windows Xp service pack 2.

Regards,

Einy
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gidds99Commented:
yes
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