Login to Microsoft SQL Server Error: 18456

Question

I am getting this error while trying to connect to the SQL Server.

Microsoft SQL Server Error: 18456

Can anybody tell me what th

Answer 1

first see the details of the error if "state" is "1" Ensure the database is set for both SQL and Windows authentication under SQL server / Properties / Security.

for other state see the above answers ....

Answer 2

1. Check whether mixed mode authentication is enabled in you server->properties
2. Then create a login in the server->security
3. create an user for that login in your database
4. Then restart your server by right clicking the instance and select restart

Answer 3

In my case multiple wrong attempts locked the account.To do that I had tried running the below query and it worked: ALTER LOGIN WITH PASSWORD= UNLOCK And make sure to set the option "Enforce Password Security" option for specific user to be unchecked by right click on Sql Server -> Properties.

Answer 4

Also you can just login with windows authentication and run the following query to enable it:

ALTER LOGIN sa ENABLE ;  
GO  
ALTER LOGIN sa WITH PASSWORD = '<enterStrongPasswordHere>' ;  
GO

Source: https://docs.microsoft.com/en-us/sql/database-engine/configure-windows/change-server-authentication-mode

Answer 5

For me, it was wrong login and password.

Answer 6

I got this error after creating a new sysadmin user under my SQL instance. My admin user was created under a specific domain MyOrganization/useradmin

Using useradmin on a disconnected environment allows you to create other users using SQL Server authentication, but as soon as you try to login you get

Microsoft SQL Server Error: 18456

To fix the problem, try to connect again to your Organization network and create the user while you are connected and then you can get disconnected and will work.