Thanks for reaching out to the Community about your concern, wamon.

I appreciate you performing the initial steps to resolve the issue. We'll have to restart the QuickBooks Database Service Manager and configure the firewall to get you back up and running.

QuickBooks Desktop 2019 uses dynamic ports and specific port numbers for better performance. They can cause unusual behavior or errors once they are blocked. To resolve the issue, refresh the connection by restarting the QuickBooks Database Service Manager.

Here’s how:

1. From your server computer, open QuickBooks Desktop.
2. Then, tap the File menu to choose Open or Restore Company.
3. Tick the radio button for Open a company file and look for the file you’re working on.
4. Once opened, click on Next to mark the box for Open file in multi-user mode and tap the Open option.
5. Next, log in to the company file and navigate to the File menu to select Close Company/Logoff.
6. This action will close the company file on your server.
7. Launch the Windows Start menu and enter Database in the search box.
8. Open QuickBooks Database Server Manager.

If the issue persists, go to the If you only installed Database Server Manager section to continue performing the troubleshooting steps in this article: Use QuickBooks Database Server Manager.

If none of these steps work, add a firewall port exception for QuickBooks. Check out this guide for the complete process: Set up firewall and security settings for QuickBooks Desktop.

You can bookmark the following link for future reference. It covers the complete instructions on how to download the QuickBooks Database Server Manager up to updating the server: Install QuickBooks Database Server Manager.

If there’s anything else I can help you with, click the Reply button to post a comment. I’ll be right here to assist further. Have a good one.