Some of my field notes while working on SCCM features and services…
Yes, there are going to be times you just have to start the Win Updates setup and config over again.
1) Uninstall SUP role
2. Uninstall WSUS
4. Delete SUSDB from SQL Server if any
5. Restart Server
6. Install WSUS (Choose to install DB not WID)
7. Configure Updates to be stored locally
8. Run Post Deployment Configuration from Server manager
9. Started WSUS Admin Console and ran Wizard (also choose to connect for the catalog sync) up to the Point where you select the products. Then, cancel wizard without choosing any products.
10. Install SUP role in SCCM and configure the right Settings (WSUS on Server 2012 Defaults to its own admin Website and ports 8530 and 8531) and select the products you require.
11. Check following log file if WSUS does not sync with SCCM.
Path: D:\Program Files\Microsoft Configuration Manager\Logs
WCM.log
wsyncmgr.log
12.) Start synchronization in the SCCM console