When encountering the 'QBdbmgrn not responding' issue in QuickBooks, which usually involves the QuickBooks Database Server Manager, follow these steps to troubleshoot and resolve the problem.

• Restart the QuickBooks Database Server Manager service on the server computer. This tool manages multi-user access to company files.

• Ensure that QuickBooks hosting mode is turned on for the server computer. Go to the 'File' tab, then to the 'Utilities', and then select 'Stop Hosting Multi-User Access.'

• Verify that all computers are connected to the same network and have proper network settings.

• Configure firewall and antivirus settings to allow QuickBooks Database Server Manager to communicate over the network.

The given solution is enough to rectify the 'QuickBooks QBdbmgrn not running' error. For further assistance, dial +1.855.738.0359.