Also, it can cause the Operating System not supported by SQL server error to appear.

What causes the Microsoft SQL server error 18456?

The Microsoft SQL Server, Error: 18456 Login Failed for user can occur for many reasons. It indicates that you have entered invalid credentials, permission problems, or SQL server settings impeding the authentication process. However, common causes that may prompt the error on your PC are:

Invalid login credentials – Users can run into the Microsoft SQL Server, Error: 18456 if they attempt to log in with invalid credentials. It can trigger the SQL server to be unresponsive because it can’t read unregistered credentials. SQL server does not have elevated permissions – When the SQL server lacks the necessary rights and administrator privileges, it can affect its processes and cause an error. It limits the access and ability the SQL server Management Studio has on your PC. Expired login password – Sometimes, the password for login can be expired, and it can cause the login credentials to be invalid and unusable. It can cause SQL Server Error 18456 to occur.

Other factors may be responsible for the error. Nevertheless, we’ll discuss solutions for fixing it and getting your SQL server Management Studio working.

How do I fix SQL Server Error 18456?

Go ahead with the following preliminary checks:

Fix network congestion on the networking computers. Restart Windows in Safe Mode and check if the SQL error persists.

Proceed with the steps below if you can’t fix the error. SPONSORED

1. Launch the SQL Server as Administrator

Allowing the SQL Server Management Studio to run as administrator will fix any permissions issues affecting it.

2. Change the SQL Server Authentication mode

Running the SQL server in Authentication mode will fix the login issues causing the error. You can check our guide on other Windows hosting SQL server you can use.

3. Launch the SQL Server in a Single User Mode

The above steps will check the SQL server’s parameters and assign the administrative role to help fix the issue.

4. Enable the TCP/IP Protocol in the Server Configuration Manager

The TCP/IP Protocol in the Server Configuration Manager will fix network issues liable to cause the Microsoft SQL Server Error 18456. Alternatively, our readers can check how to repair a corrupt SQL server database for more information on fixing SQL errors. Likewise, we have a guide on fixing the cannot generate SSPI context error in SQL Server. For more questions or suggestions, kindly drop them in the comments section below.

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