Looking for logging into the Failed For User Susdb site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Failed For User Susdb site. After that you can login as usual with your login credentials.
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/f6d5d0fe-226b-41d6-a4c4-586029d4ef92/error-logging-in-to-sql-to-move-wsus?forum=sqlsecurity
https://social.technet.microsoft.com/Forums/en-US/18b9b931-d8da-4814-b66f-d70c8a0c33f0/wsus-keeps-failing-to-start-cannot-open-quotsusdbquot?forum=configmanagersecurity
https://www.adamtheautomator.com/unable-to-connect-to-wsus-database-solved/
https://www.wsus.de/cgi-bin/yabb/YaBB.pl?num=1394098895
https://community.spiceworks.com/topic/2100609-wsus-database
https://serverfault.com/questions/73048/cant-access-windows-internal-database-in-sql-server-2008-login-fails
https://edvtraining.wordpress.com/2010/07/23/mssqlmicrosoftssee-18456-login-failed/
https://www.mcseboard.de/topic/60920-wsussqlserver-login-fails/
https://support.solarwinds.com/Success_Center/Patch_Manager/Knowledgebase_Articles/WSUS_issues_after_applying_Microsoft_KB3159706
https://www.reddit.com/r/SCCM/comments/6bb9qo/wsus_db_errors/
https://blog.nd-consulting.de/wsus-datenbank-fehler-event-id-18456/
https://hodzice.wordpress.com/2016/05/20/sccm-and-wsus-cannot-open-database-susdb/
https://www.urtech.ca/2010/12/how-to-administer-wsus-wss-using-sql-server-management-studio/