Antivirus conflicts often lead to QuickBooks database connection issues, firewall blocks, or update errors. Adding exclusions in your antivirus settings can prevent such interruptions by whitelisting QuickBooks files and ports. This forum thread explains how to configure exclusions in common antivirus software to avoid QuickBooks crashing or showing errors like H202 and 6123. Members have shared practical examples of creating QuickBooks antivirus exclusions that allowed them to run QuickBooks Desktop smoothly in multi-user mode. Join this discussion to implement exclusions successfully, or call +1-866-408-0444 for help in fine-tuning your antivirus configuration for QuickBooks.