Check both the IP address and the name of the domain controller.Īfter you tried all the possible methods list above, you still receive the same error, please check the error log as Dean Savović mentioned above and share us the detailed error message hereWindows 7 is an incredibly popular and loved operating system.

Ping command from the computer that is running SQL Server.

Verify that the domain controller of the login is accessible by using the.

If the login is in a different domain than the SQL Server, verify that the correct trusts exist between the domains.

You might receive error 15401 when the domain controller for the domain where the login resides (the same or a different domain) is not available for some reason. The same SID as an existing SQL Server login, the 15401 error occurs. When you add a Windows login as a SQL Server login, the SID is stored in a system table in SQL Server. In a Windows domain, unique Security Identifiers (SIDs) are automatically assigned to Windows logins in the domain.

If the login exists, and it is correct, and you still receive the error, continue with the following sections in this article.

Verify that you are spelling the domain and login name correctly and that you are using the following format:.

Your network administrator may have removed the Windows login for specific reasons, and you may not be able to grant that login access

Verify that the Windows login still exists in the domain.

Have you checked the other possible reasons for this issue?

Microsoft windows 7