FIX: Error message when you try to use a SQL Server authenticated login to log on to an instance of SQL Server 2005: "Logon error: 18456"
Bug #: 50000300 (SQL Hotfix) NoticeMicrosoft distributes Microsoft SQL Server 2005 fixes as one downloadable file. Because the fixes are cumulative, each new release contains all the hotfixes and all the security fixes that were included with the previous SQL Server 2005 fix release.This article describes the following about this hotfix
release:
SYMPTOMSIn SQL Server 2005, you receive a "Logon Error: 18456" error message when you try to log on to an instance of SQL Server 2005 and the following conditions are true:
Error message 1 DateTime
Logon Error: 18456, Severity: 14, State: 10.
Error message 2 DateTime Logon Login
failed for user '<username>'. [CLIENT: <IP Address>]
Note The state of this 18456 error is 10. However, you always receive this "Logon Error: 18456" error message that has a state set to 1 in the client application. To increase security, the error message that is returned to the client deliberately hides the nature of the authentication error by always setting the state of the 18456 error to 1. By default, auditing of failed logins is enabled. In this case, the true state of the 18456 error is reported in the SQL Server Errorlog file. For more information about how to troubleshoot 18456 errors, visit the following Microsoft Developer Network (MSDN) Web site: http://msdn2.microsoft.com/en-us/library/ms366351.aspx (http://msdn2.microsoft.com/en-us/library/ms366351.aspx) RESOLUTIONA supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix. If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site: http://go.microsoft.com/?linkid=6294451 (http://go.microsoft.com/?linkid=6294451) Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site: http://support.microsoft.com/contactus/?ws=support (http://support.microsoft.com/contactus/?ws=support) Note The "Hotfix download available" section and the online request forms display the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.PrerequisitesYou must have SQL Server 2005 Service Pack 1 installed to apply this hotfix.For more information, click the following article number to view the article in the Microsoft Knowledge Base: 913089 (http://support.microsoft.com/kb/913089/)
How to obtain the latest service pack for SQL Server 2005
Restart informationYou do not have to restart the computer after you apply this hotfix.Registry informationYou do not have to change the registry.Hotfix file informationThis hotfix contains only those files that are required to correct the issues that this article lists. This hotfix may not contain of all the files that you must have to fully update a product to the latest build.The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel. SQL Server 2005 32-bit version
SQL Server 2005 x64-based version
WORKAROUNDTo work around this problem, use one of the following methods:
STATUSMicrosoft
has confirmed that this is a problem in the Microsoft products that are listed
in the "Applies to" section. MORE INFORMATIONThis hotfix adds the new trace flag 4614 to SQL Server 2005. When
you enable trace flag 4614, you can use SQL Server authenticated logins that
use Windows domain password policy enforcement to log on to the instance even
though the SQL Server service account is locked out or disabled on the Windows
domain controller. You can interactively enable or disable the trace flag by using the following DBCC TRACEON and DBCC TRACEOFF commands:
For more information about the naming schema for Microsoft SQL
Server updates, click the following article number to view the article in the Microsoft Knowledge Base:
822499 (http://support.microsoft.com/kb/822499/)
New naming schema for Microsoft
SQL Server software update packages
For more information about software update
terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 (http://support.microsoft.com/kb/824684/)
Description of the standard
terminology that is used to describe Microsoft software updates
APPLIES TO
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