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The integration of new Information and Communication Technologies (ICT) within the heart of Industrial Control Systems (ICS) generated a large palette of innovative solutions. As such, the industry has undergone a new technological revolution, also known as Industry 4.0. Nevertheless, this also introduced new threats and vulnerabilities, which significantly affected the stability and the functioning of ICS. This paper reports on the integrated solution developed within the PROTECT-G project. PROTECT-G is a joint effort between academia and industry aiming at protecting the communications in legacy gas transportation systems. It provides an integrated set of protection strategies consisting of an industrial multi-layer firewall, anomaly detection systems, data protection strategies, and a remote attestation protocol.