QuickBooks Database Server Manager is a part of QuickBooks that allows users to access and share the company file in a multi-user network. ‘QuickBooks server 2021 not running’ error. QuickBooks 2021 Qbdbmgrn Not Running. The installation remains incomplete or not successful of QBDSM on your computer. To know about the QuickBooks‘ Qbdbmgrn not running on this computer 2021’ error, its causes ans troubleshooting. The Database Server Manager is a component of QuickBooks that enables users to share the company file with other computers and monitor the multi-user network. The ‘QuickBooks 2021 server not running’ error usually triggers when QuickBooks Database Server Manager is damaged or the QuickBooks is unable to connect with the server computer.