Sql Server 2012 Login Failed Error 18456

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Last Updated: May 28, 2022

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FAQs

1

How do I fix error 18456 in SQL Server 2012?

Troubleshooting Microsoft SQL Server Error 18456
  1. Step 1: Log In with Remote Desktop. ...
  2. Step 2: Run Microsoft SQL Server Management. ...
  3. Step 3: Checking the Server Authentication Mode. ...
  4. Step 4: Restart the SQL Service. ...
  5. Step 5: Checking SQL User Permissions. ...
  6. Step 6: Mapping the User to the Database.
2

Could not find a Login matching the name provided 18456 State 5?

Reason: Could not find a login matching the name provided. The login (whether using SQL or Windows Authentication) does not exist. For Windows Auth, it likely means that the login hasn't explicitly been given access to SQL Server – which may mean it is not a member of an appropriate domain group.
3

How do I fix Login failed for SA?

Go to your server, click on Security and then Logins, right click on sa and then click on Properties. Now go tot Status and then select Enabled under Login. Then, click OK. Now we can restart the SQLExpress, or the SQL you are using.
4

How do I fix SQL Server error 18452?

To fix this issue first we need to check the authentication mode set for your SQL Server Instance. If your SQL Server instance is running with windows authentication mode then you must change it to Mixed mode so that windows and SQL both type of logins can be authenticated.

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Case 1: Fix SQL Server login failed error 18456/18452. "Login failed for user" would occur if the user tries to login with credentials without being validated.

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Error number 18456 indicates a login failure. To troubleshoot the SQL Server login failure we need to determine the state of the error message.

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Date Published: May 28, 2022

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