QuickBooks Desktop may require specific firewall permissions and ports to communicate with company files, servers, and other workstations, especially when using Multi-User Mode. Allowing QuickBooks applications through Windows Firewall and configuring the appropriate inbound and outbound rules can help prevent connection problems. Firewall settings should match your QuickBooks version and network configuration. Review your security settings carefully before making changes. For assistance withQuickBooks Desktop firewall configuration and connectivity issues, call +1(866) 513-4656.