METHOD FOR UNBLOCKING EXTERNAL COMPUTER SYSTEMS IN A COMPUTER NETWORK INFRASTRUCTURE, DISTRIBUTED COMPUTING NETWORK WITH A COMPUTER NETWORK INFRASTRUCTURE OF THIS TYPE, AND COMPUTER PROGRAM PRODUCT

摘要

The invention relates to a method for unblocking external computer systems for communication with secured processing computer systems in a computer network infrastructure. An instruction packet is transmitted from an external computer system to a switching computer system within the computer network infrastructure. A random port number of a network port is then generated by the switching computer system, and the random port number is transmitted to a processing computer system. The processing computer system at least temporarily keeps predetermined network ports closed, so that access by the external computer system via the network by means of these network ports is prevented, the random port number and/or other information being able to be interchanged between the processing computer system and the switching computer system, however. Subsequently, the network port corresponding to the random port number is unblocked by the processing computer system, and a connection to the unblocked network port of the processing computer system is set up by the external computer system.