Mail avec 'Unknown user' comme erreur en delivery
Le tuto facile à comprendre et qui fonctionne
Figured I'd answer my own question.
The three commands listed above weren't enough. After the second command (the "rd /q /s"), use regedit to remove HKLM\Software\Microsoft\Windows\CurrentVersion\WindowsUpdate, then follow that with the "net start wuauserv". That resolved the 0x80246003 error on multiple Server Core 2012 hosts for us.
Thus, the steps (in our case) were:
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net stop wuauserv
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rd /q /s %windir%\softwaredistribution
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Use regedit to delete HKLM\Software\Microsoft\Windows\CurrentVersion\WindowsUpdate
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net start wuauserv
This only applies to Server 2012 (or Windows 8, most likely) hosts that had registered with the WSUS host prior to the KB2734608 patch having been applied.