The technical basis for Industry 4.0 and the desired smart factory are networked digital systems. However, digital networking at the site and across sites harbors considerable risks as well as benefits. This is why the issues of security or IT security and availability are becoming increasingly important. Wachendorff Prozesstechnik offers solutions such as Nexcom The Henge Industrial Firewalls. They offer endpoint connectivity and security through stateful packet inspection (SPI), intrusion prevention systems (IPS), VPN secure remote access (Open VPN, IPSec), port scan detection and real-time alerting. This ensures reliable protection of all devices connected behind the firewall. The implemented stealth mode (transparent mode) enables simple integration without having to adapt the existing IP address structure.