> Trying to block Yahoo! Messenger & MSN Messenger without > disallowing connections to TCP ports 443 & 563 or blocking > Yahoo! Mail and HotMail in squid v2.5 stable1.
Hello I believe you can run yahoo messenger through any port, including 80. As I recall I was able to use yim on a machine behind a firewall that allowed ONLY port 80 outbound traffic. Perhaps you can do some dns trick to break resolution, but this could probably be bypassed using a hosts file. If it is a corporate line, maybe you could put a sniffer on the traffic and publish the chats on a webserver, that would likely get people to think twice about using it. Especially if you have a written policy prohibiting use of such things. Of course, this wouldn't be as easy if the line is encrypted. Before I started my own business I worked for a large corporation that had such a policy, and they fought hard to keep the users under control. But the guy sitting in the cubicle behind me would use the company phone to call his kids EVERY DAY - across the country - and talk for 1-1/2 to 2 hours on company time, which no one ever seemed to pay much attention to. Take care, -- Waitman C. Gobble, II EMK Design +1.7145222528 http://emkdesign.com Yahoo Messenger ID sleepy_cat_69
