If QuickBooks won’t open or connect properly, your Windows Firewall might be the culprit. When the firewall blocks essential ports, QuickBooks can’t communicate with the server or access company files.

To fix this, check your firewall settings and ensure QuickBooks has the necessary permissions.

Also read:- https://asquarecloudhosting.com/if-windows-firewall-is-blocking-quickbooks-configure-it/