I been trying to block IM programs using the tutorial Mr. Shinder has posted, great post but no luck. My scenario is very simple, I have 3 network that are managed by the ISA;WIFI, Computer Labs and the Internal network, where I want to block IM programs is on the CL and internal networks.
Everytime I configure the ISA to block IM requests, the Logging tab show that traffic is been blocked but the IM clients are still able to initiate session.
I don't know what I am doing wrong, but somehow it's proven that traffic is passed by ISA.
Could you please give me some help, about this issue?
Thank you for you reply, I have checked you link and they have given me more information in how to solve to this. Thanks God and you guys I have finally blocked the Messenger 7.5 and Yahoo messenger!!!, but now I have some extra problem the new msn live messenger has a different signature!, any idea how to create a rule to block the new release of this messenger?
Unfortunately, for some reason now the users that want to check their e-mail through using hotmail.com and yahoo.com are unable to load the mail interface. Is the signature and HTTP content type filter applied has something to do with this new problem?
Thank you for your reply to my last message. At the end, I was able to block the messenger the yahoo and msn messenger with and with out the proxy server confguration. So, I was really happy and ready to deploy my configuration but unfortunately, I run some other test just to make sure that everything was OK.
And I discovered that clients on the Internal network were the messenger client filter was applied were experiencing problems using Outlook to download and send e-mails.... (SMTP& POP3). I don't know why.... I have checked the rules and just after I applied the filter for the messenger clients, the SMTP and POP3 protocolos are being blocked by the ISA Firewall... you guys have any ideas in how to solve this problem?