Re: [LIH]block yahoo and msn messenger

[Shantanu Kumar]

When someone uses MSN or Yahoo! on any of the clients, (s)he first connects to the proxy-server on a fixed proxy-hosted port, but requesting to connect further to a different (messenger-service) port. If you blocked incoming ports on the proxy, this will have no effect. Probably outgoing connections (TCP as well as UDP) have to be selectedly blocked on the proxy. Or a better technique (on the proxy) may be to discard all connection-requests other than ports for essential services like HTTP, FTP, SMTP, POP, SMB, NMB etc (since sites use to host messenger-service on multile ports too).

This reply may not be thoroughly helpful, but again, discussions are never too bad. :-)

Shantanu

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