We can configure your Database Server Manager to its default setting to get this fixed. Let me guide you through the steps.
- Open the Windows Start menu.
- Type “Services” into the search and open Services.
- Click and open QuickBooksDBXX (XX is the version number).
- Go to the General tab and find the Service status section. If it's Started or Running, select Stop.
- From the Startup type drop-down menu, click Automatic.
- Go to the Log on tab. Click the Local System account option.
- Go to the Recovery tab. Click Restart the Service from each of these drop-down menus: First failure, Second failure, and Subsequent failures.
- Go back to the General tab. Click Start to restart Database Server Manager.
Also, make sure you've set your firewall permission. Please refer to this article for the steps: Configure firewall security settings for Desktop.
Once done, try to log in again.
If it doesn't work, please perform the following:
- Reboot your server.
- Reinstall using a clean install.
You might also want to check this handy article for future reference: Account management.
Let us know if you have additional questions. We're here to help.