How to block Yahoo Messenger especially when it uses port 80? I using a CISCO router 1801. Please help!?
Actually the CISCO router 1801 has a direct option of blocking Yahoo Messenger, however its too strict that even the address page under yahoo mail is blocked. So I need to block Yahoo messenger but also not affect the mail access.
Blocking messenger services is difficult but not impossible. The newer messenger applications have been designed to thwart firewalls and other security by searching for an open port OR using the standard HTTP port 80. Most company’s have enforced Internet use by blocking all outbound traffic and using a proxy device for connection to the Internet.