Virtualised ISA 2006 faces some wierd problems
Not sure if this applies to virtualised instances of ISA 2006 on virtual server, but it sure does on HyperV. There are many variants of the problem which you can find on the internet. Here's mine
I've set up ISA 2006 on a virtual host with three network cards. One for management, one for virtual machines, and one for the Internet. ISA 2006 is connected to two of them, virtual machine and internet. Set up all the rules as I did on my physical host which is about to be decommissioned, but the funny thing is Internet access on the ISA is fine, but not on other clients. Monitoring the log tells me that all traffic is being blocked by the default enterprise deny all rule, even though the source to destination and protocol matches the rules above it.
I also realise that start-up and shut-down of ISA takes a fairly bit of time, and accessing the certificates is a pain. Remembering that other MVPs faces some problem with virtualised ISA, and many of them disabled TCP Offloading and it solved their problem. That works for me too, and it solved all the slow start-up, shut-down and access certificate.