When you install Microsoft Operations Manager (MOM) 2005, you may receive the following error message:

This error occurs if the SQL server has been renamed or if the value for the server name in SQL is NULL.The MOM Prerequisite checker looks at two entries for the computer name, and the entries must match in case and in name. The prerequisite checker runs the following queries against the master database: Note Leading or trailing spaces in the names in these tables also cause the comparison to fail.

To resolve this problem, follow these steps.

Note You may not have to reinstall Microsoft SQL Server to resolve this problem.

1. Log on by using an account that has administrative credentials.
2. Click Start, click Programs, click Microsoft SQL Server, and then click Query Analyzer.
3. In the Connect to SQL Server dialog box, click (local) in the SQL Server list, and then click OK.
4. In SQL Query Analyzer, type the following code:

   sp_dropserver 'old_name'
   GO
   sp_addserver 'new_name', 'local'
   GO

   Note In this code, old_name is a placeholder for the old name of the computer, and new_name is a placeholder for the new name. Type the actual old name and new name instead of these placeholders.
5. Click Execute Query (F5) to run the query.
6. Quit SQL Query Analyzer.

Note After you run the sp_addserver stored procedure, you must restart the SQL Server service for the change to take effect. After the server is restarted, confirm that the correct value of the new server name is returned by executing the following commands in Query analyzer: The names returned should match in spelling and case.

For more information about how to rename a computer that is running SQL Server, see the "Renaming a Server" section in SQL Server Books Online. To download SQL Server Books Online, visit the following Microsoft Web site: For more information about how to rename a computer that is running SQL Server, click the following article number to view the article in the Microsoft Knowledge Base: