Hi, @Duchemin, Dominique
Thank you for posting in Microsoft Q&A forum.
0x8024401c means Same as HTTP status 408 - the server timed out waiting for the request.
You may try to change some settings on the wsus server like this thread:
And try to repair the wsus agent with:
REG DELETE "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v SusClientId /f
REG DELETE "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate" /v SusClientIdValidation /f
net stop wuauserv
move %windir%\windowsupdate.log %windir%\windowsupdate.old.log
move %windir%\SoftwareDistribution %windir%\SoftwareDistributionold
regsvr32 /s atl.dll
regsvr32 /s wucltui.dll
regsvr32 /s wups.dll
regsvr32 /s wuaueng.dll
regsvr32 /s wuapi.dll
regsvr32 /s msxml3.dll
regsvr32 /s mssip32.dll
regsvr32 /s initpki.dll
regsvr32 /s softpub.dll
net start wuauserv
wuauclt /resetauthorization /detectnow
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