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I have a squid proxy server and my clients are running on windows xp. How can I make Windows XP reach the windows update sites through proxy? In short, through the proxy, windows can not download updates. Any advice would be appreciated.

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It should work fine if your machines have your proxy set in the system proxy settings (Control Panel -> Internet Options). Have you looked in your SQUID logs to see if there are errors? – squillman Sep 22 '11 at 13:39
Thanks for quick reply I already have done in internet option but still is not working and I had look in squid logs there is nothing for windows update, in this case what I have to do? Thank you in advance – Fanar ALHAYALI Sep 22 '11 at 13:55
Have you investigated WSUS? – Harry Johnston Sep 22 '11 at 21:25
Harry the PCs were connected to WSUS on PDC after I have returned back to workgroup. also I have tested new windows installation but can't download the updates. it's really related to proxy setting – Fanar ALHAYALI Sep 23 '11 at 6:24
Presumably the machines don't need to use the proxy to access the WSUS server, so if you point them back at the WSUS server and delete the proxy settings (proxycfg -d) they should be fine. – Harry Johnston Sep 25 '11 at 20:46
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proxycfg -p <proxy>:<port> <bypass list>

UPDATE: We see

2011-09-23      15:52:23:843     372    11c     Agent     * Access type: Named proxy
2011-09-23      15:52:23:843     372    11c     Agent     * Default proxy: 192.168.1.2:3128
2011-09-23      15:52:23:843     372    11c     Agent     * Default proxy bypass: *.local;<local>

in Windowsupdate.log, so it's configured to use proxy. Check if proxy is available from updated machine with telnet 192.168.1.2 3128 and search squid logs, the answer must be there

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I have already did it but not working because my proxy server has authentication user/pass how can I add them in proxycfg?Thank you in advance – Fanar ALHAYALI Sep 22 '11 at 15:03
proxycfg (or the ServerXMLHTTP API) does not support proxy authentication. Can't you just add an ACL which would allow unauthenticated access to *.microsoft.com or *.windowsupdate.com to your squid config? Would be the easiest route to go, I think. – syneticon-dj Sep 22 '11 at 15:26
Done but still not working :( what is the next solution? – Fanar ALHAYALI Sep 22 '11 at 16:22
Did proxy settings apply correctly? Does proxycfg without parameters display that proxy is used? If yes, check your squid logs, were there any attempts to contact updates site? – Selivanov Pavel Sep 22 '11 at 16:39
Yes, I copied the proxycfg setting C:\>proxycfg Microsoft (R) WinHTTP Default Proxy Configuration Tool Copyright (c) Microsoft Corporation. All rights reserved. Current WinHTTP proxy settings under: HKEY_LOCAL_MACHINE\ SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\ WinHttpSettings : Proxy Server(s) : 192.168.1.2:3128 Bypass List : *.local;<local> – Fanar ALHAYALI Sep 23 '11 at 6:26
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