According to one aspect, a method, system and technique for system security for network resource access using cross-firewall coded requests is disclosed. The system and technique includes a firewall, a first appliance device located behind the firewall, and a second appliance device located before the firewall. The second appliance device is configured to receive a data request, convert the data request into a coded request, and transmit the coded request to the first appliance device, and wherein the coded request corresponds to a specific type of data request. The first appliance device is configured to receive the coded request from the second appliance device and, if the coded request corresponds to one of a plurality of codes of a command list maintained by the first appliance device, process the data request.