This usually points to a network, hosting, firewall, or QuickBooks Database Server Manager issue. Before making changes, make sure the company file is stored on the computer or server that is configured to host it.

Try these steps:

1. Confirm that the company file is stored in a shared network folder.
2. Make sure QuickBooks Database Server Manager is installed and running on the server.
3. Open QuickBooks on the server and verify that hosting is enabled correctly.
4. Check that the required QuickBooks network ports are not being blocked by Windows Firewall.
5. Run QuickBooks File Doctor from QuickBooks Tool Hub to check for network and company-file connection problems.
6. From each workstation, open the company file using the correct network location.
7. Restart QuickBooks and the server after making network changes.

If QuickBooks still cannot communicate with the company file, the issue may involve damaged network configuration, incorrect folder permissions, or a problem with the company file itself.

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