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When you encounter the "QBDBMgrN not running" error in QuickBooks, it typically means that the QuickBooks Database Server Manager service is not running on the system that hosts your company file. This can occur in a multi-user setup where one computer is used as the server. To resolve the issue, you should first ensure that QuickBooks Database Server Manager is installed and running on the server computer. You can manually start the service from the Windows Services menu. Also, check that the firewall settings allow QuickBooks to communicate through the network and that there are no network connectivity issues. If needed, reinstalling the QuickBooks Database Server Manager can help resolve the issue