"Login failed for user 'NT AUTHORITY\NETWORK SERVICE'. Reason: Failed to open the explicitly specified database 'SUSDB'. [CLIENT: <named pipe>]"
If you look on the internet for a bit you'll find several solutions saying to remove the referenced KB. I say nay to that.
Basically the steps boil down to:
- Open an elevated Command Prompt and run "C:\Program Files\Update Services\Tools\wsusutil.exe" postinstall /servicing
- Enable HTTP Activation under .NET Framework 4.5 Features in the Server Manager Add Roles and Features Wizard
- Restart the WSUS service
No need to uninstall KB3159706.
Source: https://social.technet.microsoft.com/Forums/windows/en-US/233a6b37-5919-4a9e-9538-aa0e7bd7111a/wsus-console-service-cant-start-reason-failed-to-open-the-explicitly-specified-database?forum=winserverwsus