You may receive an error code indicating Event ID 18456 for SQL Server 2008 r2. There are different ways to solve this problem, and this is what we will discuss now.
Don’t let Windows errors hold you back.
Error 18456 is common when mixed authentication is enabled. You may be trying to log in with Windows Authentication with a user that is not recognized by the specific SQL Server and with a SQL login username. Error 18456 occurs when you are using SQL Server Authentication and our own username or password is incorrect.
|Product name||SQL Server|
|Message text||Connection for user ‘%. * ls’.%. * ls failed|
If a login attempt is interrupted due to an authentication error that experts believe includes an incorrect password or username, a message similar to the following is returned to the user: “Login failed for PC user ‘
Additional Error Information
What is error number 18456 in SQL Server?
The general message “Login failed for user (Microsoft SQL Server, error а: 18456) ‘means that you entered an invalid trace entry when logging into SQL Server. In the screenshot below, I am logging into Microsoft SQL Server Management Studio with a user who does not have administrative rights when he needs to log into the server.
Where are SQL error logs stored?
By default, the error log is located in the Programs Microsoft SQL Server MSSQL folder. n MSSQL LOG ERRORLOG, then ERRORLOG. n files.
For additional baAs a security measure, you supplement the phone error message returned to the responder and intentionally mask the nature of this authentication error. However, in the SQL Server error log, the identical error contains an error condition that is passed into an authentication error condition. Compare the error status with the list of cases where you need to determine the cause of the connection failure.
|1||The error was not available. Typically indicate this unless you are authorized to receive detailed information about the error. Contact your current SQL Server administrator for new information.|
|2||Invalid user ID.|
|5||Usually the user ID is not valid.|
|6||An attempt was made to use a Windows login with an SQL Authentication Server. East|
|7||Connection disconnected with invalid password.|
|8||Very wrong password.|
|9||Invalid password. East|
|11||The connection is valid, butThe server was not accessed. The likely cause of this error is whenever a Windows user can access SQL Server as a member of the Local Administrators group, but Windows still does not provide administrator credentials. To establish a connection, start the connection program with the optional Start Administrator option, remembering to add the Windows user – SQL Server as the selected login.|
|12||The connection was valid, but simple access to the server failed.|
|18||The password needs to be changed.|
|38, 46||The user requested by the database was not found.|
|58||If SQL Server is configured to use Windows authentication only, the client tries to connect with SQL authorization. Another reason is when the SIDs are far from overlapping.|
|122-124||Error due to blank advertising username or password.|
|126||The database requested by the smoker does not exist.|
There are other error statements that unexpectedly represent the best internal processing error.
Cause of error An attempt to connect using sql authentication failed. The server is configured for authentication windows only. can be returned in the following situations.
How do I change Windows authentication to SQL authentication?
Select the “Basic Security” section. In the Server Authentication section, switch the selection from Windows Authentication to SQL Server and Windows Authentication. Click on OK.Click on OK.
If the server is assumed to be configured for mixed mode authentication, the ODBC connection also uses TCP, and the connection does not explicitly indicate that the connection will use a trusted connection.
How do I fix Microsoft SQL Server Login failed?
Step 1. Log in using Remote Desktop.Step 3. Start Microsoft SQL Server administration.Step 3. Check the server authentication mode.Step 4: restart the SQL service.Step 5: Check SQL user permissions.Step 6: Map the user to the database.
If the web server is configured for mixed mode validation and the ODBC connection uses name pipes, and the credentials used to open the named bottle are used to automatically impersonate most users and the connection does not explicitly indicate that the connection is must use a trusted connection. Fix
For this type of issue, add TRUSTED_CONNECTION = TRUE to your connection string.
In this example, this particular authentication error status is 8. This means that the password is almost certain incorrect.
|2007-12-05 20:12: 56.18456, 34||Registration||Error: Severity: 14, Status: 8.|
|2007-12-05 20:12: 56.34||Register|| Login failed for user “
If you are trying to connect using SQL Server Authentication, make sure your SQL hosting is configured in Mixed Mode Authentication. For more information on changing the SQL Server Authentication Mode, see Changing the Server Verification Mode
When you try to log in using SQL Server Authentication, you find that the SQL Server account exists and in most cases you are specifying it correctly.
If people are trying to log in with working Windows authentication, make sure you are logged into the correct domain.
If your own error indicates status 1, contact your SQL Server administrator.
When you decide to enter the systemhim with administrator rights, run the application with the “Run as administrator” parameter. When you are logged in, add your Windows user as an individual login.
If the database engine architecture supports stand-alone databases, ensure that the login has not been deleted after navigating to the stand-alone database user.
When connecting from local stores to an instance of SQL Server, connections for services running on NT AUTHORITY NETWORK SERVICE often need to be authenticated using the fully qualified domain name of the computer. For more information, see How To: Use a Network Service Account to Access Resources in ASP.NET
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