If you do not, you will need to reinstall the network configuration on the server system and reconfigure it for multi-user access. Another possible cause of this error is an antivirus software program on your computer, which can prevent QB programs from functioning correctly. To resolve this, you must create exclusions for QB programs in the antivirus software on your computer. Then, restart the application and check if the QBCFMonitorService is working. If the issue persists, you should contact an IT professional to address the problem. Fix QBDBMgrn Not Running After QuickBooks Update (2023/2024)