Error 18456 Severity 14 State 5
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Error 18456 Severity 14 State 16
you logged on your SQL Server? Appreciate your elaboration for your scenario. NETWORK SERVICE and LocalSystem will authenticate themselves always as the corresponding account locally (built in\network service and built in\system) but both will authenticate as the machine account remotely.If you see a failure like Login failed for user 'DOMAIN\MACHINENAME$' it means that a process running as NETWORK SERVICE or as Local System has accessed a remote resource, has authenticated itself as the machine account and was denied authorization. We could fix this issue by following method: Add the machine account to your SQL Server. You can first locally log on your SQL Server instance with a local administrator via SSMS, expand Security folder->right click Login->click New Login..., check Windows Authentication and type the machine account "Domain\ServerName$" as the login name, and then you may assign the account permissions by selecting the server roles and
of Plan Explorer and a performance monitoring and event management platform for the Microsoft Data Platform and VMware. He has been blogging here at sqlblog.com since 2006, focusing on manageability, performance, and new features, and also
Error 18456 Severity 14 State 6
blogs at blogs.sentryone.com and SQLPerformance.com; has been a Microsoft MVP since 1997; tweets as @AaronBertrand; and error 18456 severity 14 state 11 speaks frequently at major conferences, user group meetings, and SQL Saturday events worldwide. Troubleshooting Error 18456 I think we've all dealt with error 18456, error 18452 severity 14 state 1 whether it be an application unable to access SQL Server, credentials changing over time, or a user who can't type a password correctly. The trick to troubleshooting this error number is that the error message returned to the client https://social.msdn.microsoft.com/Forums/sqlserver/en-US/e2d819ed-49dd-4e18-87f1-05a6dc86a8c6/error-18456-severity-14-state-5?forum=sqldatabaseengine or application trying to connect is intentionally vague (the error message is similar for most errors, and the state is always 1). In a few cases, some additional information is included, but for the most part several of these conditions appear the same to the end user. In order to figure out what is really going wrong, you need to have alternative access to the SQL Server and inspect the log for the true state in the error message. I http://sqlblog.com/blogs/aaron_bertrand/archive/2011/01/14/sql-server-v-next-denali-additional-states-for-error-18456.aspx helped our support team just today solve a client's 18456 issues - once we tracked down the error log and saw that it was state 16, it was easy to determine that their login had been set up with a default database that had been detached long ago. In SQL Server 2012, there is a new feature called "contained databases" - I've blogged about it here and here. With this feature comes a new layer of security that may creep onto your radar if you use this functionality: contained user authentication failures. There are a variety of things that can go wrong here. If you connect with a contained user but forget to specify a database name, SQL Server will attempt to authorize you as a SQL login, and you will fail with state 5 (if there is no SQL login with that name) or state 8 (if there is also a SQL login with the same name and the password doesn't match). There is also a new state 65 which occurs if you have specified the correct username and contained database, but entered an incorrect password. The way that the authentication process works is, if SQL Server doesn't find your user in the contained database you specifies, it tries again at the server level, then gives up (it won't go check all the other contained databases in case you match there - I hope you agree th
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 http://logicalread.solarwinds.com/errors-sql-server-login-failures-pd01/ 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 error 18456 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 severity 14 state 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 2015-06-21 10:58:19.400 Logon Error: 18456, Severity: