QBDBMgrN not running on this computer” is an error message that appears when QuickBooks can’t connect to the company file in multi-user mode because of firewall restrictions on QuickBooks database server manager. If you are also dealing with such an error in QuickBooks and need step-by-step instructions to get rid of the error on immediate basis, then follow this article until the end. For any additional help and guidance from certified QuickBooks Desktop experts you can dial QuickBooks Desktop helpline number 844-888-4666.