环境：windows xp sp1，位于isa server后
问题：使用windows auto update 后出错误提示：0x8024402C，不能自动更新。
解决：
1、查看$windows/windowsupdata.log文件，日志中有如下记录：
Send failed with hr = 80072ee7.
SendRequest failed with hr = 80072ee7. Proxy List used: <(null)> Bypass List used : <(null)>
GetConfig: 0x8024402c
PT: Cannot recover from fault, origin=GetConfig, hr=0x8024402c
Sync of Updates: 0x8024402c
WU client failed Searching for update with error 0x8024402c
WU client calls back to search call WindowsUpdate with code Call failed and error 0x8024402c
2、运行proxycfg
Current WinHTTP proxy settings under
HKEY_LOCAL_MACHINE SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\WinHttpSettings :
Flags = PROXY_TYPE_DIRECT
Proxy Server = -not set-
Bypass List = -not set-
3、运行proxycfg -u，而后在Proxy Server及Bypass List设置上均会有值
4、运行net stop wuauserv，后运行net start wuauserv
5、问题解决