The error QBDBMGRN not running on this computer server indicates QuickBooks Database Server Manager has stopped working. This disrupts access to shared company files on your network. Find the right fixes to get your system running again.
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QBDBMGRN Not Running On a Computer Server (Latest Solution)

The error message in QuickBooks “QBDBMGRN not running on a computer server” means that the database server manager has stopped working.