Hi,
Thank you for posting in Microsoft Q&A forum.
1,A bloated SUS database may cause this issue. You can clean the database up to have a try. Similar thread for your reference:
2,It also can be firewall or proxy issue, please check the settings.
Install and Configure WSUS on Windows Server 2019
3,I highly doubt this is the cause but good to check
WSUS synchronization fails with SoapException
Thanks for your time. Have a nice day!
Best regards,
Simon
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