‘QBDBMgrN Not Running On This Computer’ is an error message that suddenly manifests while trying to use the multi-user mode to access the data file. This issue occurs due to an outdated Windows firewall setup. You must update your Windows firewall setup & restart the QB Database Service on the server computer to tackle this issue. Access the reliable resolutions inside this blog or dial 1-855-856-0042 to connect with a QB Specialist.