I am new to ISA 2004 and Surfcontrol 5.0 and just discovered a problem with our filtering. If I attempt to view a site which is blocked (based on its FQDN) using it's IP address then I can get past our URL filtering.
http://www.facebook.com/ - blocked by Surfcontrol
http://188.8.131.52/ - not blocked by anything.
How do I block URLs which are based on IP addresses instead of FQDNs using ISA or Surfcontrol 5.0?