Table of Contents
SQL Server Error: sql server error 18456
Severity: 14
Event Logged or not: Yes
Description:
Login failed for user ‘%.*ls’.%.*ls%.*ls
Severity 14 Description:
Indicates security-related errors, such as permission denied.
Attribute | Value |
---|---|
Product Name | SQL Server |
Event ID | 18456 |
Event Source | MSSQLSERVER |
Component | SQLEngine |
Symbolic Name | LOGON_FAILED |
Message Text | Login failed for user ‘%.*ls’.%.*ls |
When a connection attempt is refused due to an authentication failure involving an incorrect password or user name, the client receives a message that looks like this: “User ‘user name>’ was unable to log in. (Error: 18456 in Microsoft SQL Server) “..
The following is additional information that was returned to the client:
"Login failed for user '<user_name>'. (.Net SqlClient Data Provider)"
"Server Name: <computer_name>"
"Error Number: 18456"
"Severity: 14"
"State: 1"
"Line Number: 65536"
The following message might also be returned:
"Msg 18456, Level 14, State 1, Server <computer_name>, Line 1"
"Login failed for user '<user_name>'."
Identifying SQL Server Error Log File used by SQL Server Database Engine can be done by reading SQL Server Error Logs. DBA can execute the XP_READERRORLOG extended stored procedure to read the SQL Server Error Log and search for its location used by the instance of SQL Server.
USE master
Go
xp_readerrorlog 0, 1, N'Logging SQL Server messages in file', NULL, NULL, N'asc'
Go
For other ways to read and find error log location please our artcile https://sqlserver-dba.co.uk/error-log/sql-server-identify-location-of-the-sql-server-error-log-file.html
In error sql server error 18456 , the information of nature of the authentication issue is purposefully hidden in the error message sent to the client to increase security. However, a comparable error for sql server error 18456 in the SQL Server error log provides an error status that corresponds to an authentication failure condition. Determine the cause of the login failure by comparing the error status to the following list for sql server error 18456.
State | Description of error sql server 18456 |
---|---|
1 | Error information is not available. This state usually means you do not have permission to receive the error details. Contact your SQL Server administrator for more information. |
2 | User ID is not valid. |
5 | User ID is not valid. |
6 | An attempt was made to use a Windows login name with SQL Server Authentication. |
7 | Login is disabled, and the password is incorrect. |
8 | The password is incorrect. |
9 | Password is not valid. |
11 | Login is valid, but server access failed. One possible cause of this error is when the Windows user has access to SQL Server as a member of the local administrators group, but Windows is not providing administrator credentials. To connect, start the connecting program using the Run as administrator option, and then add the Windows user to SQL Server as a specific login. |
12 | Login is valid login, but server access failed. |
18 | Password must be changed. |
38, 46 | Could not find database requested by user. |
58 | When SQL Server is set to use Windows Authentication only, and a client attempts to log in using SQL authentication. Another cause is when SIDs do not match. |
102 – 111 | AAD failure. |
122 – 124 | Failure due to empty user name or password. |
126 | Database requested by user does not exist. |
132 – 133 | AAD failure. |
Other error states also exist for error sql server 18456 and signify an unexpected internal processing error.
Also to note: In error sql server 18456 “An attempt to log in with SQL authentication was unsuccessful. Only Windows authentication is enabled on the server.” In the following circumstances, it is possible to return it.
Activity Monitor in SQL Server 2008 :
Open up Activity Monitor Using Object Explorer
In Object Explorer, right click the SQL Server 2008 Instance and click on Activity Monitor.
Also can be opened from SQL Server 2008 Management Studio’s toolbar, by clicking Activity Monitor
It shows the graphical display of Processor Time (%), Number of Waiting Tasks, Database I/O (MB/Sec) and the Number of Batch Requests/second.
For information on SQL Server Activity monitor go to https://sqlserver-dba.co.uk/sql-server-administration-basics/activity-monitor
Or using SQL Query analyzer window to run sp_who2 command which is less resource intensive and gives same information as activity monitor.
SQL Server Error: sql server error 18456
Severity: 14
Event Logged or not: Yes
Description:
Login failed for user ‘%.*ls’.%.*ls%.*ls
Make sure username, password are correct.
Quick checks for error sql server 18456 is using if AD username with windows authentication then make sure account is not locked out.
Also if recently changed AD username with new password then try log off and log back in for resolving error sql server 18456.
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