2016-07-08 23:53:59.63 Logon Login failed for user 'IAAS6620137\MyInfraWindowsLogin'. Reason 2016-07-08 23:02:07.42 Logon Error: 18456, Severity: 14,

The error "`Microsoft SQL Server, Error: 18456 `" means that the user used to login to SQL Server Management Studio is invalid. It is usually related to an AAD user which is not added on SQL DB that you are trying to connect (User DB or Master DB) or that the AAD user is not the AAD Server Admin.

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Generally, it happens even if the username is accepted. And the error message displayed does not define the reason. However, administrators can check the error details in the event log to get a clear picture of the problem. This software prudentially solves SQL Server login failed 18456 and its different state levels without any harm. Using this software you can ultimately login in SQL SA and User account and execute operation on the SQL database. SqlException Login failed for user 'admin', number 18456 // If it not fails after CREATE DATABASE, everything works fine. var command = new SqlCommand (sql, connection) command.

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Add Comment. by Marc. 29 Sep 2010 How to solve – “Login failed for user 'sa'.

Mar 30, 2016 Login failed for user 'confuser'. Reason: Login-based server access validation failed with an infrastructure error. Check for previous errors.

Reason: Token-based server access validation failed with an Login failed for user 'sa'. (Microsoft SQL Server 2017, Error: 18456). 3 years ago. Add Comment. by Marc. 29 Sep 2010 How to solve – “Login failed for user 'sa'.

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The generic message "Login Failed for User (Microsoft SQL Server, Error: 18456)" means you entered invalid credentials when logging into SQL Server. In the below screen shot, I am logging into Microsoft SQL Server Management Studio with a user that does not have administrative permissions to connect to the server. Probable causes of SQL server login error code 18456. SQL Server login failures can happen due to various reasons.
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(Microsoft SQL Server, Error: 18456)". Additional information returned to the client includes the following: "Login failed for user ''.