OK .. background is that we have an NT4 domain with several external trusts that connect to us for using certain resources.

One of these is web access. Each trust (and other sites that don't have a trust) are given an NT4 User ID and password to authorise against our resource - in this case a caching only ISA Server.

We now need to make sure that User A from Site A can not go to Site B and user his credentials from A to logon at B.

Is there a way to do this, because I can't think of one right now? Using either add-ins, ISA or NT4 itself.

Thanks ....