QuickBooks Error 12002 occurs when the software fails to access the server due to internet connectivity issues, incorrect configuration settings, or interference from firewalls and antivirus programs. To fix this, ensure a stable internet connection and make Internet Explorer your default browser with TLS 1.2 enabled in Advanced Settings. Update QuickBooks to the latest version to resolve compatibility problems. Configure your firewall or antivirus to allow QuickBooks through and ensure network settings don’t cause timeouts. Additionally, run QuickBooks as an administrator to avoid permission issues. If these steps don’t resolve the error, call TFN 866-703-0747 for expert guidance. Professional support ensures the problem is resolved quickly, minimizing disruption to your business operations.