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SQL SERVER 2005 – FIX Error: 18456 : VISTA Windows Authentication

Pinal Dave
SQL Tips and Tricks
106 Comments

In previous post I have mentioned about SQL SERVER 2005 – Vista Ultimate and SQL Server 2005 DEV Edition. There was one simple issue with the installation. I was not able to login using windows authentication method. I was able to successful login using sa username and password. Windows Authentication kept failing with Error 18456. If Vista Windows Authentication gives you the same trouble, the fix below is short.

I kept on receiving following error.

TITLE: Connect to Server
——————————
Cannot connect to SQLAUTHORITY.
——————————
ADDITIONAL INFORMATION:

Login failed for user ‘SQLAUTHORITY\Pinal’. (Microsoft SQL Server, Error: 18456)

For help, click:

——————————
BUTTONS:
OK
——————————

After a while I realize that this may be due to one needs Administrator rights to do any task in SQL Server. I added the my current login as administrator in SQL Server and next time I was able to login successfully using Windows Authentication.

Following diagrams explains the fix.

1. Error while using Windows Authentication

SQL Server authentication window.

2. Login using SA username and password and go to Security >> New Login

SQL Server Management Studio - Logins.

3. Type In Login Name as ComputerName\UserName

SQL Server Authentication Window.

4. Click Server Roles and check sysadmin server role, after that click OK.

SQL Server login settings window.

5. Now login using Windows Authentication and it should work fine.

SQL AUTHORITY' Object Explorer window in SQL Server Management Studio.

Published by Pinal Dave on SQLAuthority. More of my work at pinaldave.com.

SQL Error Messages, SQL Server Security, Vista
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