Right Click on Instance - Go to properties - Click on security – change to “SQL Server and Windows Authentication mode” – Restart the InstanceĪfter SQL Server instance restart you should be able to connect. Solution: Modify the Server is to use both SQL Server and Windows Authentication mode. The document referenced below explains all the states, this is just a summary. Ĭause: The server is configured for Windows authentication only and not able to connect using SQL Server Authentication. Error 18456, Severity 14: Login Failed States. Server is configured for Windows authentication only. I tried to reinstall SQL Server which failed with error 'No instance in this computer'. But I don't find any instance in my SQL Server object explorer. I have read many suggestions to change the authentication mode by right clicking the instance. Reason: An attempt to login using SQL authentication failed. Error Number: 18456 Severity: 14 State: 1 Line Number: 65536.
23:06:46.80 Logon Login failed for user TestDB. 11:15:28.280 Logon Login failed for user sql. User is able to connect using Windows credentials, but not able to connect using “SQL Server Authentication” using SQL Server Management Studio and ODBC. 11:15:28.280 Logon Error: 18456, Severity: 14, State: 5. Login failed for user “TestUser”.(Microsoft SQL Server, Error: 18456) Users may encounter SQL Server login failures with below error message.
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