Symptoms: The WSUS console fails to connect and the event log states:
Reason: Failed to open the explicitly specified database ‘SUSDB’
1. Open an elevated Command Prompt and run “C:\Program Files\Update Services\Tools\wsusutil.exe” postinstall /servicing
2. Verify that HTTP Activation under .NET Framework 4.5 Features in the Server Manager Add Roles and Features Wizard is enabled.
3. Restart the WSUS service