How To: Block unauthenticated access in WFISA
Blocking Anonymous (Unauthenticated) users. (ISA Only)
Blocking access to certain sites for Anonymous users in WebFilter for ISA can be used when you need to allow certain Machines to communicate to the internet anonymously but do not want them to be able to access certain sites such as XXX or Gambling.
In ISA/TMG, create an Access Rule that will allow the affected machines to access the proxy ‘Anonymously’
In WebFilter for ISA, create a new custom access Policy that blocks the categories/URLs that should not be accessed or use one of your existing policies
On the ‘Apply To’ tab under the Custom Access Policy’ properties, add the ‘Unauthenticated Access’ group