Hi,
According to your description, my understanding is that Selfupdate folder is missing on IIS.
On WSUS server, please make sure that below folder is exisit:
C:\Program files\Update services\Setup folder
Then, open IIS and try to manually add virtual directory:
Alias:
Selfupdate
Physical path:
%programfiles%\update services\selfupdate
Then, check the result.
Best Regards,
Eve Wang
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