QBDBMgrN Not Running On This Computer error occurs when QuickBooks Database Manager service fails to start, preventing multi-user access. To fix it, restart the service via Windows Services (services.msc), set it to Automatic startup, and verify network permissions. For persistent issues, reinstall QuickBooks Database Manager. Need multi-user help? Our QuickBooks experts resolve QBDBMgrN errors daily—contact us now at 855-888-3080