Are you receiving
Cannot open database “SUSDB” requested by the login. The login failed.~~Login failed for user ‘NT AUTHORITY\NETWORK SERVICE’ ?
Easy fix : Remove KB3159706
More complicated fix : https://support.microsoft.com/en-us/help/3159706/update-enables-esd-decryption-provision-in-wsus-in-windows-server-2012-and-windows-server-2012-r2