How to fix ‘Microsoft SQL Server error 18456’ Windows 10

What is ‘Microsoft SQL Server error 18456’ in Windows 10/8/7?

In previous post, we discussed on How to fix ‘Windows could not start the SQL Server on local computer’ error in Windows 10. If you are facing ‘Windows could not start the SQL Server on local computer’ error, then you can access the post and follow the instructions mentioned on post to resolve the issue. In this post, we are going to discuss on How to fix Microsoft SQL Server error 18456 in Windows 10/8/7. Let’s starts the discussion.

‘Microsoft SQL Server error 18456’ is SQL Server error occurs usually while try to connect to SQL server. This error is appeared with message saying ‘Login Failed for user (Microsoft SQL Server error: 18456)’. One possible reason behind this error is invalid credentials you have entered when trying logging into SQL server.

Users reported that they faced this error when tried to logging into Microsoft SQL Server Management Studio with a user account that doesn’t have ‘Admin’ or Administrative permissions to connect the server. Usually, user account you logged in with you installed SQL Server or the user account that is default admisntrator account on computer. However, it is possible to resolve the issue. Let’s go for the solution.

How to fix ‘Microsoft SQL Server error 18456’ in Windows 10/8/7?

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Method 2: Manual steps to fix Microsoft SQL Server error 18456

Step 1: Use Remote Desktop: To resolve this issue, you need to login to the server or at least be able to make Windows Authentication Connection on MS SQL using MS SQL Server Management Studio. You can easily connect to the server with Remote Desktop Connection. To do so, click on ‘Start’ button, type ‘Remote Desktop’, now fill the required field like IP of your server or resolvable hostname, username, password and then hit ‘Connect’.

Step 2: Launch Microsoft SQL Server Management Tool: Once you logged into the server, now open ‘Microsoft SQL Server Management Tool’ – offers you to configure, manage and administer MS SQL. When you start this tool, you will be asked to log into server. It means you need to enter necessary credentials to log into your server including Windows Admisntrator. Select ‘SQL Server Authentication’ option from ‘Authentication’ dropdown (you can choose the option depending on version SQL Server installed in computer).

Step 3: Check SQL Server and Windows Authentication Mode: Once you log into SQL Server Management Studio (SSMS) using ‘Windows Authentication’, you need to check the security settings and confirm that MS SQL is set up to allow both Windows and SQL Authentication. To do so, right-click on your ‘Server Name’ at top of ‘Object Explorer’ window and select ‘Properties’. Now, click the ‘Security’ page in left pane and in right pane, select ‘SQL Server and Windows Authentication Mode’ option. You will be asked to log into MS SQL with SQL user & password or Windows user & password.

Step 4: Restart the SQL service: To do so, right-click on at top of ‘Object Explorer’ in SSMS and select ‘Restart’ to apply new authentication mode settings.

Step 5: Now, check SQL user account permissions: To do so, expand ‘Security’ folder in left pane in SSMS Object Explorer and then expand ‘Logins’. Check if any user account name shows ‘ Red x’ on it that user has login disabled. You need to allow the user to login and to do so, right-click the user and select ‘Properties’. Click on ‘Status’ page in left pane and select ‘Enabling login’ for user and then hit ‘OK’. Please check if the ‘Red x’ issue is resolved after refreshing the page.

Step 6: Check user mapping to verify the user has access to desired database: Finally, you need to check user mapping to verify the user has access to the desired database and set or verify the role for the database. To do so, right-click the user and select ‘Properties’, click on ‘User Mapping’ page and select ‘Database’, select the desired/required memberships from database role memberships and then hit ‘Ok’. Once done, please if Microsoft SQL Server error 18456 issue is resolved.

Conclusion

I am sure this post helped you on How to fix Microsoft SQL Server error 18456 issue in Windows 10 with several easy steps. You can read & follow our instructions to do so. That’s all. For any suggestions or queries, please write on comment box below.

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