I have just installed a new ISA Server 2006 Standard for a customer. I have also got the problem described here.
I built the server, added it to the domain, fully patched it, then installed ISA Server 2006.
During the install it detected the Domain Controllers and created a Pre Defined Domain Controllers Computer Set which I cannot ADD/EDIT/DELETE.
I have the Standard edition installed so I don't have the registry key described and wondered if there is a fix for it.
Thanks in advance
You can edit the domain controller computer set by changing de following dword in the registry:
"msFPCDescription"="Domain Controllers in domain in which the ISA Server is a member."
This one "msFPCPredefined"=dword:00000000 is standard dword:00000001
I think the keys will not be the same (mostly the numbers), but with this info you can find it.