Error message when you start Microsoft Dynamics GP: "Your attempt to log into the server failed because of an unknown error. Attempt to log in again."

Method 1

Restart the instance for SQL Server that is being used with Microsoft Dynamics GP. To do this, follow these steps depending on the SQL Server version you are using.

Microsoft SQL Server 2000

1. Click Start, point to All Programs , and then click Enterprise Manager.
2. In the Connect to Server window, follow these steps:
   
   1. In the Server name box, type the name of the server that is running SQL Server.
      
   2. In the Authentication box, click SQL Authentication.
      
   3. In the login box, type sa.
      
   4. .
3. Right-click the instance name of the SQL Server, click Stop, and then clickStart.
   
   
   

Microsoft SQL Server 2005 and SQL Server 2008

1. Click Start, point to All Programs , point to Microsoft SQL Server 2005 or Microsoft SQL Server 2008 , and then click SQL Server Management Studio.
2. In the Connect to Server window, follow these steps:
   
   1. In the Server name box, type the name of the server that is running SQL Server.
   2. In the Authentication box, click SQL Authentication.
   3. In the login box, type sa.
      
   4. In the Password box, type the password for the sa user, and then click Connect.
3. Right-click the instance name of the SQL Server, and then click Restart.
   
   
   
   
   

Method 2

To resolve this issue, start Microsoft Dynamics GP or Microsoft Dynamics GP Utilities as the sa user. To do this, follow these steps:

1. On a computer that is running Microsoft Dynamics GP 10.0, point to All Programs, point to Microsoft Dynamics, point to GP 10.0, and then click GP OR click Utilities.
   
   Notes
   • If you are running Microsoft Dynamics GP 9.0, click Start, point to All Programs, point to Microsoft Dynamics, point to GP 9.0, and then click GP OR click Utilities.
   • If you are running Microsoft Business Solutions Great Plains 8.0, click Start, point to All Programs, point to Microsoft Business Solutions, ppoint to Great Plains, and then click Great Plains OR click Great Plains Utilities.
2. In the login box, type sa.
3. In the Password box, type the password for the sa user, and then click OK.
   
   

Method 3

To resolve this issue, re-create the tables by using the dex_req.sql script. To do this, follow these steps:

1. Locate the dex_req.sql file that is located in the installation folder.
   
   Notes
   • If you are running Microsoft Dynamics GP 10.0 or 9.0, the default location is C:\Program Files\Microsoft Dynamics\GP\SQL\Utililty\0.
   • If you are running Microsoft Business Solutions-Great Plains 8.0, the default location is located on a Server installation at C:\Program Files\Microsoft Business Solutions\Great Plains\SQL\Util.
2. Open the dex_req.sql file in Query Analyzer or Management Studio, and then click Execute to run the script.