There are many factors responsible for QBDBMGRn not running on this computer issue; these are: 

• The firewall is either missing or improperly configured.

• QBDBSMGRn has not been updated to the most recent release.

• There is an issue with QuickBooks Network papers.

• The QB Server Manager was not displayed.

• QuickBooks is not working because you are writing computer programs behind a firewall.

• The QB isn't able to connect to the network.

• Unwilling to use the QBW organizational details.

• Working with multiple clients fails.

• QBDBSM is incapable of being properly refreshed.