QuickBooks Firewall Blocking refers to a situation where the firewall on a computer or network is preventing QuickBooks from accessing the internet or other network resources. QuickBooks is popular accounting software that is designed to help small and medium-sized businesses manage their finances. However, QuickBooks firewall blocking sometimes the firewall on a computer or network can block QuickBooks from connecting to the internet or accessing other network resources. See also: QuickBooks Payroll Item List