Hi DinoZoff,
By default, WSUS SSL use https port 8531. Since I didn't use Shavlik, I could only provide the following guide for your reference:
https://community.shavlik.com/docs/DOC-23502
(This is a third-party article, it may change its content without notification, we do not guarantee its safety.)
Besides, as far as I'm concerned, if the issue is related about the Shavlik unable to connect the WSUS, maybe you can get better help in Shavlik community.
Best Regards,
Anne
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