Software Update Services and ISA server

From: Jacques Schenk (jschenk_at_zeelandnet.nl)
Date: 03/30/04 

Date: Mon, 29 Mar 2004 23:21:11 -0800

I use Software Update Services which connects through ISA server to the internet.
This worked fine, however only until i implemented the fix to prevent authenticated user from receiving a logon box when they try to access content of a unauthorised sites
([HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3Proxy\Parameters]:"ReturnDeniedIfAuthenticated"=1)

Now the SUS server no longer downloads the updates, although the account used to retreive the updates has access to site through ISA server, it downloads the files fine without the reg entry .
The error i get is:
Failed to download from URL 'http://www.msus.windowsupdate.com/msus/v1/aucatalog1.cab'. (Error 0x801901F6: HTTP error 502. The proxy server returned an error.)

How do I get SUS to work with ISA and the ReturnDeniedIfAuthenticated=1 option

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