Yes, I checked that in worked on port 80 without SSL. And it worked just fine.
And when I rollback to not using SSL then it works again.
I have also tried rolling back to using port 8530 and then enabling SSL on port 8531 - same issue.
So it is an SSL issue.
First I used our wildcard SSL from RapidSSL, but I have read something about WSUS not being to happy about wildcard certificates. So I have also tried creating a certificate from our internal CA - same issue.
I am not sure what I need to do on the WSUS server with the link you mention. Yes - I have installed the certificate in order to choose it in the IIS bindings. And also the intermediate certificate from the CA.
Am I misunderstanding what you mean?