I have WSUS 3.0 SP1.
My computers have not reported status for ages.
I can't remember when it stopped working, possibly when Sharepoint was installed, Sharepoint has now been removed.
Server also has Symantec Endpoint Protection Manager on it.
WSUS Administraton is on port 8530
Self Update is also in Default Website on port 80.
See attached output from ClientDiag.exe and WindowsUpdate.log.