To fix QuickBooks Error 12057, ensure your internet connection settings are correct and verify that your system’s date and time are accurate. Adjust your firewall and security settings to allow QuickBooks through, and configure your QuickBooks update settings appropriately. If the error persists, consider reinstalling QuickBooks. For expert assistance, call +1-800-845-9666. Professional support can help diagnose and resolve the issue promptly, ensuring your QuickBooks functions smoothly.