WSUS Sync Failing

Within the last hour or so I have carried up a cleanup of our WSUS and reindexed the database as per this article https://blogs.technet.microsoft.com/configurationmgr/2016/01/26/the-complete-guide-to...

cm current branch

software update management

Deleted

Jul 26, 2017

So it would appear that this issue is only when a proxy is specified within the site system properties of the primary site server

I am just wondering why this would all of a sudden start happening it would appear as a result of carrying out the WSUS cleanup and database reindex as per the link provided? Unless just a mere coincidence

Also On the proxy logs I am not even seeing an attempt from the SCCM server to access the Windows update URL's only https://fef.msub05.manage.microsoft.com/ which is intune and passes successfully.

When I remove the proxy I can see connection to https://fe2.update.microsoft.com/

Continuing to investigate.