The error message "QBCFMonitorService not running on this computer" denotes that the QuickBooks Connection Diagnostic Tool was unable to locate the required QuickBooks Database Server Manager service running on the machine. For QuickBooks' network and multi-user modes to function, this service is necessary. Users should manually start the QBCFMonitorService to fix this problem or troubleshoot the service to make sure it is up and operating properly for proper QuickBooks multi-user access. Contact our QuickBooks Experts Team at 1.855.738.2784 if you need immediate help.