Error 18456 14
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Anybody can answer The best answers are voted up and rise to the top Login failed for user Error: 18456, Severity: 14, State: 11 up vote 3 down vote favorite 1 I have an AD group XYZ that I have added to SQL Server security with data_reader permissions. The XYZ group has around 10 users in there who are successfully able to access the SQL Server database. I recently added error 18456 severity 14 state 6 a new user to this group (at AD level), but this person is not able to access SQL Server (through Mgmt Studio) and he's getting the error below Login failed for user. Reason: Token-based server access validation failed with an infrastructure error. Check for previous errors. Error: 18456, Severity: 14, State: 11. I have already verified AD permissions are setup properly, user has restarted his machine, he is not part of any group that has DENY access and the SQL Server XYZ group has been removed and readded to the SQL Server instance in Mgmt Studio and server has been restarted. Any ideas on how to proceed further? Thanks! sql-server sql-server-2008-r2 active-directory share|improve this question edited Jun 17 '13 at 13:19 Yasir Arsanukaev 2,38121126 asked Mar 25 '13 at 22:19 Amam 84138 migrated from stackoverflow.com Mar 26 '13 at 6:15 This question came from our site for professional and enthusiast programmers. Can you have the new user try from another computer and see if that's the issue? Wondering if it's an AD setup issue, since your other users are working. –Jason Whitish Mar 25 '13 at 22:23 sqlblogcasts.com/blogs/simons/archive/2011/02/01/… –Aaron Bertrand♦ Mar 25 '13 at 22:26 Has the user logged off and logged on
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here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company http://stackoverflow.com/questions/20923015/microsoft-sql-server-error-18456 Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million http://logicalread.solarwinds.com/errors-sql-server-login-failures-pd01/ programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Microsoft SQL Server Error: 18456 up vote 47 down vote favorite 8 I am getting this error while trying to connect error 18456 to the sql server. Microsoft SQL Server Error: 18456 Can anybody tell me what the error code means? sql-server connection error-code share|improve this question edited Jun 29 '15 at 13:28 ughai 8,37031238 asked Jan 4 '14 at 15:43 merazuu 3983615 5 A cursory search seems to indicate that the error code is a login failure, and is generally accompanied by more detailed information. –David Jan 4 '14 at 16:03 And that error 18456 severity more detailed info should be in the sql server error log. The number itself deliberately doesn't tell you much, so crackers can't use it for clues on where their attempts are going wrong. –Tony Hopkinson Jan 4 '14 at 16:10 8 @David if you see a duplicate question in SO, then mark this as such. Just because the answer is easy to come by, doesn't mean it doesn't belong on SO. This is the first hit on Google after all :). –Josh Noe Feb 24 '14 at 19:52 add a comment| 7 Answers 7 active oldest votes up vote 103 down vote accepted if you're trying to connect using "SQL Server Authentication" then you may want to modify your server authentication ; Right click server and click properties go to security page under Server authentication, choose the SQL Server and Windows Authentication mode radio button click OK restart your server this might help you ! share|improve this answer answered Apr 30 '14 at 18:35 Aringan 1,173378 Exactly what I needed, thank you! –jlbruno Jan 9 '15 at 15:20 3 Thanks. Shame there is no warning message when you try to add users. –JohnnyBizzle Feb 4 '15 at 10:45 9 What exactly do you mean "Right click server and click properties" where is this? &
Server Login Failures By Pinal DaveWhen asked about common errors encountered in a SQL Server environment, you might expect to hear about high CPU issues, but in reality, these are rare and few. In fact, many DBAs report connectivity issues with SQL Server as among the most frequently encountered errors. These errors can further be classified into two sub-categories: Login request not reaching SQL Server. Login request reaching SQL Server and then failing. Let's look at each of these scenarios in this article. Scenario 1: Login request not reaching SQL Server A typical error received by a client might be: Transact-SQL A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections 1 A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections There can be multiple reasons for this error, including these, based on work I've done with clients and queries I've responded to in user forums: Using the incorrect instance name. The SQL Service is not running. Port not open. (Note that telnet is the best test possible to detect this). The SQL Browser Service not running. (This is needed to get port of named instances. IP, PortNumber - can be specified to identify this issue.) Incorrect DNS entry and request going to different machine. (Note that ping is the best test to find name and IP address mapping). Scenario 2: Login request reaching SQL Server and then failing This second scenario results from authentication or security related errors. The error message received by the client would as shown below: Transact-SQL Login failed for user 'username'. (Microsoft SQL Server, Error: 18456) 1 Login failed for user 'username'. (Microsoft SQL Server, Error: 18456) For security reasons (and to a hacker’s disadvantage), SQL Server avoids revealing the exact cause of error message. The way to troubleshoot these errors is to look into the SQL Server Errorlog. The location of the file can be found using SQL Server Configuration Manager. Under startup parameters, we need to look at -e which stands of path of Errorlog. Below are some error messages which we have seen a lot, taken from SQL Server 2014. Transact-SQL 2