If you're having issues with QuickBooks Database Manager not running, there are several troubleshooting steps you can take to fix it. Here are some potential solutions:

1. Restart the QuickBooks Database Server Manager: Close all QuickBooks processes and services, then restart the QuickBooks Database Server Manager.

2. Check the status of the QuickBooksDBXX service: Press Windows + R, type "services.msc" and press Enter. Locate the QuickBooksDBXX service and check its status. If the status is "Stopped", right-click on the service and select Start.

3. Add exceptions to firewall settings: Ensure that the firewall settings are not blocking the QuickBooks Database Manager from running. Add exceptions to the firewall settings for QuickBooks Database Manager.

4. Verify the QBDataServiceUserXX user is set up correctly: Check whether the QBDataServiceUserXX user is set up correctly. Go to the Control Panel and open the User Accounts. Ensure that the user is added and has administrator rights.

5. Repair QuickBooks installation: Repair the QuickBooks installation to resolve any issues with the installation files.

6. Update QuickBooks Database Server Manager: Ensure that the QuickBooks Database Server Manager is up to date. Go to the Help menu in QuickBooks and click on "Update QuickBooks Desktop."

7. Check for damaged files: Use the QuickBooks File Doctor tool to detect and repair any damaged company files.

8. Reinstall QuickBooks Database Server Manager: If none of the above solutions work, you may need to uninstall and reinstall QuickBooks Database Server Manager.

If you are not able to fix the issue using these solutions, you should contact QuickBooks technical support at 855 738 0359 for further assistance.