ISA / Trend WebProtect

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Running ISA in Cache mode, single NIC - just tried the trial of Trend InterScan WebProtect (which meant having to install IIS!) which installed and was registered OK under Web Filters.

However the browser presented at the proxy was presented with the IIS under construction page.

Any ideas on how to resolve this

There is reference in the Trend documentation to the http redirector as below - I'm not sure what this means.

Note: The ISA Application filter, HTTP redirector, should be
activated on the ISA Server so that the FireWall can redirect
all http requests to the web proxy to make sure all traffic will
pass through InterScan WebProtect.

The trend instructions are online at

http://www.antivirus.com/download/documentation/internetgateway/iswp.htm

TIA