I did configure the SSL Tunneling using port 911 recommended by Mcrosoft Q283284. After running this script, I checked the registry and found that the new port has been added (so far so good). I rebooted the machine (just to be on the safe side) and started up the Internet Explorer (6.0). When trying to access a URL, I'm still getting the same old HTTP 502 12211 error message. I even try to re-install the ISA Enterprise (including SP1 - Note: SP2 has been installed on Window 2000) and still no go. I even remove the SSL 443 and 563 tunnel port from the registry but again the same result. This is starting to become a real headache and ready to throw this product out!!! I cannot understand why Microsoft develop a product that seems so simple to configure but difficult to debug (a typical Microsoft way). Any other suggestions, ideas???? Thank you.