Trouble Shooting WSUS problems - Clients not populating in WSUS Admin Console

I have had to install WSUS twice on my server due to conflicts with SEPM, the first install WSUS was configured to use Port 80, and I used the Default Domain Policy to direct Client Computers to it.

when i was reinstalling the WSUS to use port 8530, i created a policy called WSUS on the DC, that would control clients automatic Update configuration. unforunately only 4 out of over 120 PC's only reported to the WSUS.

Doing Start ->Run, then rsop.msc on one of the failing machines showed Group Policy was not being applied correctly, i realised that the Default domain Policy was still having the old settings of my first WSUS configuration i.e. the intranet update server was showing http://servename instead of http://servername:8530.

Cleaning out the Default Domain Policy of all windows Updates setting and allowing the WSUS policy that had the right settings did the trick, all my computers populated and reported to the WSUS Console within hours.