1. Verify Credentials

• Ensure that the username and password of the SQL account (domain\username) are correct.
  

• Check if the user account is locked or disabled.

• Try connecting to the SQL Server using a query tool like SQL Server Management Studio (SSMS) or DB Visualizer (with MS JDBC driver) using the same account.

2. Check Local Security Policy

• Ensure the user account is added to the "Access this computer from the network" policy.
  

3. Update SQL Service Account (if required)

If the SQL account is also used as the SQL Server service account, and you've recently changed its password, make sure the updated password is reflected in the service configuration:

1. Open SQL Server Configuration Manager.
   
2. Click on SQL Server Services.
   
3. In the right pane, right-click on SQL Server (<instance name>) and select Properties.
   
4. Under the Log On tab, enter the new password in both the Password and Confirm Password fields.
   
5. Select OK to apply the changes. 
   

4. Check for NTLM Restrictions

On the database server, check if NTLM authentication is restricted:

1. Navigate to Computer Configuration → Windows Settings → Security Settings → Local Policies → Security Options
   
2. Look for the NTLM-related settings.
   
3. If NTLM is restricted, remove the restriction or configure it to allow Windows authentication.