"Error 0x80190191" in Windows Update Log on Clients

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Does anyone have an explanation for this error? This is the Windows Update.log from one of the AU clients. SUS is running on a Windows 2000 Member Server in an NT4.0 domain and the client in question is a Windows 2000 Member Server with SP3. I have some other clients that are Windows 2000 Professional and they have the same problem.

003-01-30 13:38:20 19:38:20 Error IUCTL Failed to download iuident.cab from http://SUSSERVER to E:\Program Files\WindowsUpdate\V4 (Error 0x80190191)
2003-01-30 13:38:20 19:38:20 Success IUCTL Ignore above error, use local copy of iuident.cab from E:\Program Files\WindowsUpdate\V4
2003-01-30 13:38:20 19:38:20 Success IUCTL Checking to see if new version of Windows Update software available
2003-01-30 13:38:20 19:38:20 Success IUENGINE Starting
2003-01-30 13:38:20 19:38:20 Error IUENGINE Library download error. Will retry. (Error 0x80190191)
2003-01-30 13:38:21 19:38:21 Error IUENGINE Library download error. Will retry. (Error 0x80190191)
2003-01-30 13:38:21 19:38:21 Error IUENGINE Library download error. Will retry. (Error 0x80190191)
2003-01-30 13:38:25 19:38:25 Success IUENGINE Determining machine configuration
2003-01-30 13:38:28 19:38:28 Error IUENGINE Querying software update catalog from http://SUSSERVER/autoupdate/getmanifest.asp (Error 0x80190191)
2003-01-30 13:38:28 19:38:28 Success IUENGINE Shutting down
2003-01-30 13:38:28 19:38:28 Success IUCTL Shutting down

Contributed by Wayne Flynn
Error 80190191 is an HTTP error '
401 Unauthorized'. Your IIS server is requiring your client computer to authenticate, when, in fact, it should be allowing anonymous access. Check that the SUS site has anonymous access enabled and that the NTFS permissions are not preventing the 'IUSR_machinename' account from reading the contents of the SUS site.

Run your IIS log (at '
C:\winnt\system32\logfiles\w3svc1' ) through my interpreter at http://www.pdxconsulting.com/sus to get a bit more information on what is happening.
 

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