Found two articles on the now.netapp.com site about netcache and windows update.
 
Solution ID: ntapcs6927
Solution ID: kb5388  -- looks like this one is more likely - it specifically mentions BITS.

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From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Michael Schipp
Sent: Thursday, July 21, 2005 6:03 PM
To: toasters@mathworks.com
Subject: NetCache 5.6.2 and Windows updates

Hi all,

      I am having a problem with a NetCache in transparent mode with clients using Windows Updates.

 

      I have added the info from the NetCache logs and Windows Update logs. Has anybody seen this before?  Any ideas on what could be causing the problem?

 

      Also getting something very similar for Apple updates.

 

from NetCache log file

 

1121930841.463 1.381 138.25.254.13 TCP_MISS_PRIVATE_METHOD/200 405 HEAD http://www.download.windowsupdate.com/msdownload/update/v3-19990518/cabpool/windowsxp-kb885836-x86-enu_f87074f42947ee275445bdd34dda472871ed3b41.exe - DIRECT/144.135.8.190 "application/x-msdownload" -

 

From WindowsUpdate.log

 

8d0 DnldMgr *********** DnldMgr: New download job [UpdateId = {A13230F5-0B6A-4857-9E4E-6B5FC174A319}.10] ***********

 

2005-07-20 07:57:59 988 8d0 DnldMgr * BITS job initialized, JobId = {D4ADF644-F1A1-4724-883B-408399EECB60}

 

2005-07-20 07:58:00 988 8d0 DnldMgr * Downloading from http://www.download.windowsupdate.com/msdownload/update/v3-19990518/cabpool/windowsxp-kb885836-x86-enu_f87074f42947ee275445bdd34dda472871ed3b41.exe to C:\WINDOWS\SoftwareDistribution\Download\S-1-5-18\0f034613258cda0f8c8da15d1b762ae0\WindowsXP-KB885836-x86-ENU.exe (full file).

 

2005-07-20 07:58:02 988 ee4 DnldMgr WARNING: BITS job {D4ADF644-F1A1-4724-883B-408399EECB60} failed, updateId = {A13230F5-0B6A-4857-9E4E-6B5FC174A319}.10, hr = 0x80200011, BG_ERROR_CONTEXT = 5

 

2005-07-20 07:58:02 988 ee4 DnldMgr Progress failure bytes total = 528616, bytes transferred = 0

 

2005-07-20 07:58:02 988 ee4 DnldMgr Failed job file: URL = http://www.download.windowsupdate.com/msdownload/update/v3-19990518/cabpool/windowsxp-kb885836-x86-enu_f87074f42947ee275445bdd34dda472871ed3b41.exe, local path = C:\WINDOWS\SoftwareDistribution\Download\S-1-5-18\0f034613258cda0f8c8da15d1b762ae0\WindowsXP-KB885836-x86-ENU.exe

 

2005-07-20 07:58:02 988 ee4 DnldMgr WARNING: Download job failed because of insufficient range support.

 

2005-07-20 07:58:02 988 ee4 DnldMgr Error 0x80200011 occurred while downloading update; notifying dependent calls.

 

2005-07-20 07:58:02 988

 

Thanks

Michael.