A system with a data-processing and/or data-generating production device, which comprises a network interface, and with a device connected thereto for connecting the data-processing and/or data-generating production device to a network, preferably a data-processing facility such as a server across the network, with - a memory, - at least one processor, which can access the memory in a reading and writing capacity, - a first network interface to be connected to the network, - a second network interface to be connected to the production device, - a program code of a computer program stored in the memory for execution by the at least one processor, wherein the program code includes program code, during the execution of which data packets received at the second network interface via a second protocol are forwarded to the first network interface and sent there via a first protocol into the network, in particular to the data processing facility such as the server, and/or during the execution of which data packets received at the first network interface via a first protocol are forwarded to the second network interface and sent there via a second protocol to the production device, wherein the program code further includes program code, during the execution of which the at least one processor applies a packet filter to the data packets on the way between the network interfaces, wherein the packet filter during execution by the processor checks the headers of arriving packets to be filtered, wherein, depending on the result of the check of the respective headers, the packets are discarded or forwarded, wherein the system is characterised in that the production device includes at least one housing, and the signal link between the device and the production device completely extends within the housing, wherein the device is preferably arranged in the housing. - a memory, - at least one processor, which can access the memory in a reading and writing capacity, - a first network interface to be connected to the network, - a second network interface to be connected to the production device, - a program code of a computer program stored in the memory for execution by the at least one processor, wherein the program code includes program code, during the execution of which data packets received at the second network interface via a second protocol are forwarded to the first network interface and sent there via a first protocol into the network, in particular to the data processing facility such as the server, and/or during the execution of which data packets received at the first network interface via a first protocol are forwarded to the second network interface and sent there via a second protocol to the production device, wherein the program code further includes program code, during the execution of which the at least one processor applies a packet filter to the data packets on the way between the network interfaces, wherein the packet filter during execution by the processor checks the headers of arriving packets to be filtered, wherein, depending on the result of the check of the respective headers, the packets are discarded or forwarded, wherein the system is characterised in that the production device includes at least one housing, and the signal link between the device and the production device completely extends within the housing, wherein the device is preferably arranged in the housing.