ISA2004 blocking thinkuknow.co.uk when using IE8

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Having quite an annoying problem with ISA 2004 and any PC's that seem to have IE8 installed on them, in particular when trying to access thinkuknow.co.uk

For some reason the ISA2004 system seems to be thinking the client computer is trying to spoof DHCP or similar and as a result it kills the IE session as soon as I try clicking on any of the age bands on the thinkuknow site.

I am looking to remove the ISA 2004 system completely from the system (as per a different thread) but lack a suitable machine to complete this on this week so I was wondering if there's anything I can do with the ISA2004 configuration that might at least help me resolve the situation short term until the Smoothwall box is in place to take over.

Tips gratefully received and beers owed...

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perhaps this :
* create a custom HTTP protocol on port 80
* DEselect HTTP filter from this new protocol
* create an access rule that allows internal traffic to thinkuknow.co.uk
* Place this rule above your normal internet access rule

maybe it works
bio..

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Belated thanks for appreciate the reply...

In the end I had to go with installing the smoothwall box earlier than expected and setting that up as the firewall, then removing ISA 2004.

To say that the internet speed and general network stability improved would be something of an understatement, so glad my hand was forced so's to speak.