Ports:

https://quickbooks.intuit.com/learn-support/en-us/data-utilities/configure-firewall-security-settings-for-desktop/00/201468


Reset Server Firewall to default to resolve Quickbooks Database Manager Firewall blocking issue:

https://quickbooks.intuit.com/learn-support/en-us/install/windows-firewall-is-blocking-quickbooks/00/203319



OVERALL Quickbooks configuration and fixes:

https://quickbooks.intuit.com/learn-support/en-us/multi-user-mode/resolve-network-issues-with-quickbooks-file-doctor-test-results/00/201283


The QuickBooksDBXX service on Local Computer started and then stopped:

https://quickbooks.intuit.com/learn-support/en-us/multi-user-mode/the-quickbooksdbxx-service-on-local-computer-started-and-then/00/206034