This blog post will help you if you have mssqlserver error number 18456.
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Error 18456 Microsoft SQL Server connection failure can occur for many reasons. When this error occurs, you entered the correct device name, but for most unexpected reasons, you cannot allow Internet browsing. This error can occur regardless of the SQL Server edition you are using or the type of SQL Server you are using (Enterprise or Express).
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Details
| attribute | value | |
|---|---|---|
| Product name | SQL Server | |
| Event ID | 18456 | |
| Event Source | MSSQLSERVER | |
| component | SQL Engine | |
| Character text | Connection name | logon_failed |
| Error message for user ‘%. * ls’.%. * ls |
Explanation
If your login attempt is rejected due to an actual errorFor authentication that includes an invalid username, a message similar to the following is returned to the prospect: “Login failed for user ‘
Additional Error Information
For added security, the error message returned to the client intentionally masks the environment in which the authentication failed. However, in the SQL Server error log, the reconciliation error contains a status error that is actually related to the authentication error state. Compare each error condition with the following list and determine the cause of the connection error.
| State | Description | |
|---|---|---|
| 1 | Error analysis not available. This state basically means that you are not authorized to receive information about the error. Contact your SQL Server administrator for more information. | |
| 2 | User ID may be invalid. | |
| 5 | Invalid user IDBody. | |
| 6 | An attempt was made to use a Windows login with SQL Server authentication. | |
| 7 | The connection has been disconnected and the password is incorrect. | |
| 8 | Usually the password is incorrect. | |
| 9 | Invalid password. | |
| 11 | Logical connection, access to the server failed. One possible reason for this error is that a Windows smoker has access to SQL Server as another member of the Local Administrators group, while Windows does not provide administrator credentials. To log on, run the logon utility, often using the Run as administrator option, and then promote the Windows SQL user to Server because a specific logon is required. | |
| 12 | The connection is valid and access to the server has failed. | |
| 18 | The password needs to be changed. 46 | May |
| 38, The database requested by the user could not be found. | ||
| 58 | When SQL Server is configured to use Windows Authentication only and the client is tries to use SQL authentication. Another reason is that the SIDs do not match. | |
| 102 2) 111 | AAD error. | |
| 122-124 | Error due to empty client name or password. Requested | |
| 126 | The user database does not exist. | |
| 132-133 | AAD error. |
Other errors are stored in states and indicate an unexpected internal computation error.
Cause of error Failed to connect using SQL Authentication. The server is for Windows authentication only. can be returned in the following situations.
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If the server is typically configured for mixed mode authentication, and a high-performance ODBC connection uses TCP, and the connection is not explicitly specified, most connections should use trusted ownership.
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If the server is configured for mixed authentication and the ODBC connection uses the mentioned pipes and the credentials that the client uses to open the named pipe for automaticimpersonation of the user, and it is not explicitly stated in this connection that our own channel connection must use a trusted connection.
To resolve this issue, include TRUSTED_CONNECTION = TRUE in your connection string.
Examples
In this example, the validation error status is 8. This means that the password is incorrect.
| Date | Source | Message |
|---|---|---|
| 2007-12-05 20:12: 56.18456, 34 | Registration | Error: Severity: 14, Status: 8. |
| 2007-12-05 20:12: 56.34 | Register | Login failed due to user “ |
User Response
If you are trying to connect using SQL Server Authentication, make sure SQL Server is configured in Mixed Mode Authentication. For more information on changing levels in SQL Server Authentication Mode, see Changing Server Authentication Mode
If you are trying to log in using SQL Server Authentication, make sure the SQL login isServer exists and someone wrote it correctly.
If you’re having trouble logging in with Windows Authentication, check who successfully logged into the solution domain.
If your error status is 1, contact your SQL Server administrator.
If you want to log in using administrator credentials, try the “Run administrator like this” option. Once the connection is established, add your own Windows user as a separate connection.
If the database engine supports stand-alone databases, ensure that this login was not removed after migration for the stand-alone database user.
For a local connection, which can be an instance of SQL Server, connections to services running on NT AUTHORITY NETWORK SERVICE are authenticated using the fully qualified URL of the computer. For more information, see How To: Use a Network Service Account to Access Resources in ASP.NET
If SQL Server is configured in Windows Authentication mode and returns to p For SQL Server and Windows authentication, the sa connection is disconnected first. This results in an error in state 7: “Login failed for user sa”. To allow all login sessions, change the server authentication mode .
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Step 1. Log in using Remote Desktop.Step 2. Start the administration of Microsoft SQL Server.Step 3: Usually check the server authentication mode.Step 4. Restart the SQL service.Step 5. Check SQL user permissions.Step 6: Map the user who will be using the database.
The generic message “User login failed (Microsoft SQL Server, error: 18456)” means that you entered invalid credentials when visiting and SQL Server. In the following UI, I enter Microsoft SQL Server Management Studio with a user who does not have administrator rights to map the server.
Right click on your server.Access to the security option.Check the alternate “SQL Server and Windows Authentication Mode”.Click the OK button.
