Hi Adrien,
All systems on the domain are kept up-to-date with MS Update - which would be Windows update 6.x. Automatic updates are used. MS Update and automatic update no longer work via the proxy server, so I have unchecked the box to transparently handle NAT in the proxy server. Automatic update and MS update work corrrectly - and very quickly - via NAT. Security is handled in system policies - which is the same for NAT and the WWW proxy.
I include the relevant portion of the windowsupdate.log from a system:
2006-10-11 12:04:19 1908 15ec DtaStor Update service properties: service registered with AU is {7971F918-A847-4430-9279-4A52D1EFE18D}
2006-10-11 12:04:19 1908 15ec DnldMgr *********** DnldMgr: New download job [UpdateId = {F1510774-612D-4385-8AB6-701FE5A2CB1E}.105] ***********
2006-10-11 12:04:19 1908 15ec DnldMgr * Queueing update for download handler request generation.
2006-10-11 12:04:19 1908 15ec DnldMgr Generating download request for update {F1510774-612D-4385-8AB6-701FE5A2CB1E}.105
2006-10-11 12:04:30 1908 15ec Handler Windows Patch download for UpdateId = {F1510774-612D-4385-8AB6-701FE5A2CB1E}: selected action is download full-file.
2006-10-11 12:04:30 1908 15ec DnldMgr *********** DnldMgr: New download job [UpdateId = {F1510774-612D-4385-8AB6-701FE5A2CB1E}.105] ***********
2006-10-11 12:04:31 1908 15ec DnldMgr * All files for update were already downloaded and are valid.
2006-10-11 12:04:31 1908 15ec DtaStor Update service properties: service registered with AU is {7971F918-A847-4430-9279-4A52D1EFE18D}
2006-10-11 12:04:31 1908 15ec Agent *********
2006-10-11 12:04:31 1908 15ec Agent ** END ** Agent: Downloading updates [CallerId = AutomaticUpdates]
2006-10-11 12:04:31 1908 15ec Agent *************
2006-10-11 12:04:31 1908 1788 AU >>## RESUMED ## AU: Download update [UpdateId = {A1D1B486-0C12-4CE6-8162-FC9B26ACD757}, succeeded]
2006-10-11 12:04:31 1908 15ec DnldMgr *************
2006-10-11 12:04:31 1908 15ec DnldMgr ** START ** DnldMgr: Downloading updates [CallerId = AutomaticUpdates]
2006-10-11 12:04:31 1908 15ec DnldMgr *********
2006-10-11 12:04:31 1908 15ec DnldMgr * Priority = 2, ServiceId = {7971F918-A847-4430-9279-4A52D1EFE18D}
2006-10-11 12:04:31 1908 15ec DnldMgr * Updates to download = 1
2006-10-11 12:04:31 1908 15ec Agent * Title = Security Update for Microsoft .NET Framework, Version 2.0 (KB922770)
2006-10-11 12:04:31 1908 15ec Agent * UpdateId = {5B93B9A1-DFA4-4321-88A1-8028858D54E0}.102
2006-10-11 12:04:31 1908 15ec Agent * Bundles 1 updates:
2006-10-11 12:04:31 1908 15ec Agent * {4A7CC0C1-CA9E-4A29-9E0F-D54EB640C4B6}.102
2006-10-11 12:04:31 1908 15ec DnldMgr *********** DnldMgr: Downloading regulation Odf ***********
2006-10-11 12:04:31 1908 15ec DnldMgr * ServiceId = {7971F918-A847-4430-9279-4A52D1EFE18D}
2006-10-11 12:04:31 1908 15ec DnldMgr * URL =
http://rs.update.microsoft.com/odf/v6odf.xml
2006-10-11 12:05:33 1908 15ec Misc WARNING: Send failed with hr = 80072f78.
2006-10-11 12:05:33 1908 15ec Misc WARNING: SendRequest failed with hr = 80072f78. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2006-10-11 12:05:33 1908 15ec Misc WARNING: WinHttp: SendRequestUsingProxy failed for <http://rs.update.microsoft.com/odf/v6odf.xml>. error 0x80072f78
2006-10-11 12:05:33 1908 15ec Misc WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f78
2006-10-11 12:05:33 1908 15ec Misc WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f78
2006-10-11 12:05:33 1908 15ec Misc WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f78
2006-10-11 12:06:35 1908 15ec Misc WARNING: Send failed with hr = 80072f78.
2006-10-11 12:06:35 1908 15ec Misc WARNING: SendRequest failed with hr = 80072f78. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2006-10-11 12:06:35 1908 15ec Misc WARNING: WinHttp: SendRequestUsingProxy failed for <http://rs.update.microsoft.com/odf/v6odf.xml>. error 0x80072f78
2006-10-11 12:06:35 1908 15ec Misc WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f78
2006-10-11 12:06:35 1908 15ec Misc WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f78
2006-10-11 12:06:35 1908 15ec Misc WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f78
2006-10-11 12:07:37 1908 15ec Misc WARNING: Send failed with hr = 80072f78.
2006-10-11 12:07:37 1908 15ec Misc WARNING: SendRequest failed with hr = 80072f78. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2006-10-11 12:07:37 1908 15ec Misc WARNING: WinHttp: SendRequestUsingProxy failed for <http://rs.update.microsoft.com/odf/v6odf.xml>. error 0x80072f78
2006-10-11 12:07:37 1908 15ec Misc WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f78
2006-10-11 12:07:37 1908 15ec Misc WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f78
2006-10-11 12:07:37 1908 15ec Misc WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f78
2006-10-11 12:08:39 1908 15ec Misc WARNING: Send failed with hr = 80072f78.
2006-10-11 12:08:39 1908 15ec Misc WARNING: SendRequest failed with hr = 80072f78. Proxy List used: <(null)> Bypass List used : <(null)> Auth Schemes used : <>
2006-10-11 12:08:39 1908 15ec Misc WARNING: WinHttp: SendRequestUsingProxy failed for <http://rs.update.microsoft.com/odf/v6odf.xml>. error 0x80072f78
2006-10-11 12:08:39 1908 15ec Misc WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072f78
2006-10-11 12:08:39 1908 15ec Misc WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072f78
2006-10-11 12:08:39 1908 15ec Misc WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072f78
2006-10-11 12:08:39 1908 15ec DnldMgr FATAL: DM:CDownloadRegulator::DownloadOdf: WinHttpDownloadFile failed with 0x80072f78.
2006-10-11 12:08:39 1908 15ec DnldMgr * Last proxy send request failed with hr = 0x80072F78, HTTP status code = 0
2006-10-11 12:08:39 1908 15ec DnldMgr * Caller provided credentials = No
2006-10-11 12:08:39 1908 15ec DnldMgr * Impersonate flags = 0
2006-10-11 12:08:39 1908 15ec DnldMgr * Possible authorization schemes used =
2006-10-11 12:08:39 1908 15ec DnldMgr FATAL: DM:CDownloadRegulator::Refresh: DownloadOdf failed with 0x80072f78.
2006-10-11 12:08:39 1908 15ec DnldMgr FATAL: DM:CAgentDownloadManager::DownloadUpdates: Refresh failed with 0x80072f78.
2006-10-11 12:08:39 1908 15ec
Kindest Regards,
Bob Tucker