I am getting a failed login message in the SQL Server error logs however, nothing actually failed?
From Aaron Bertrand's blog on Troubleshooting Error 18456


  Error: 18456, Severity: 14, State: 58.
  Login failed for user ''. 
  Reason: An attempt to login using SQL authentication failed. Server is configured for Windows authentication only.


State 58 occurs when SQL Server is set to use Windows Authentication only, and a client attempts to log in using SQL Authentication.

You have to Change Server Authentication Mode and restart sql server, if you/your software requires SQL Server authentication and your sql server is configured for Windows Authentication.