Embodiments of the invention are directed to techniques for preventing access to protected resources by unauthorized individuals by enabling an administrator associated with a transport computer to customize filtering rules via a user interface. In some embodiments, a server computer can, from a client computer, receive credentials of the administrator. The credentials can be used to retrieve requesting computers registered with the transport computer. The requesting computers may then be displayed at the client computer. A selection of one of the requesting computers is received from the client computer. A plurality of settings, which represent rules controlling which authorization request messages from the selected requesting computer are forwarded, are displayed at the client computer, wherein one of the settings references one or more attributes that distinguish certain authorization request messages. In response to receiving a selection of the respective setting, modifying the rules in accordance with the plurality of settings.