Secure Access for
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Secure Remote Connections

As the Industrial Internet of Things (IIoT) trend continues to gather pace, more and more system operators want to control their industrial applications, such as automation, transportation, and energy over secure remote connections. The ability to be able to remotely monitor, maintain, and diagnose issues can push the boundaries of industrial manufacturing and significantly reduce operational costs. However, cybersecurity is a real concern for system operators when transmissions are conducted over open networks or the Internet. To ensure transmissions remain secure, a virtual private network (VPN) is often used to set up encrypted communication tunnels that provide secure remote access to applications. However, the requirements for secure remote access may vary depending on the application or industry. To build secure remote connections, network devices must comply with certain industry certifications. As a trusted partner in the automation industry, Moxa provides product solutions that meet industry requirements and simplify remote connections for Operation Technology (OT) engineers.

Secure Communications

When accessing data remotely, transmissions must be encrypted.


The need for remote access has been increasing over the past few years as more and more remote sites require access to a central network. Due to the concern of a man-in-the-middle attack that could occur where someone steals or relays messages transmitted within the communications path, remote access should take place through an encrypted VPN tunnel.

Connection Flexibility

The requirements of a VPN vary depending on the application.


A common occurrence is when system operators build site-to-site communications for remote sites, which requires an IPsec VPN server and client. Another frequently encountered scenario is when an engineer is outside the factory but needs to connect to the machines inside the factory for remote maintenance. For this, an OpenVPN is suggested in order to establish encrypted communications.

Reliability and Resilience

It is essential to ensure security without compromising reliability.


Devices that are deployed in industrial environments must be robust enough to withstand harsh environments. Therefore, network devices are required to comply with standards such as UL 508 for industrial control equipment and Class I Division 2 for the Oil & Gas industry. Finally, in order to enhance the reliability of the network, system operators also need redundancy in their networks.

Requirements for Secure Remote Access

  • Secure Communications

    When accessing data remotely, transmissions must be encrypted.

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  • Connection Flexibility

    The requirements of a VPN vary depending on the application.

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  • Reliability and Resilience

    It is essential to ensure security without compromising reliability.

    Learn More

VPN Solutions

  • Secure Remote Monitoring

    Field-to-Site VPN Tunnel

    • Secure remote access using a VPN
    • Controls network traffic between different trusted zones using a firewall
    • Supports IPsec for data encryption and authentication
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  • Secure Remote Data Acquisition

    Site-to-Stie VPN Tunnel

    • Secure remote access using a VPN
    • Inspects industrial protocols using PacketGuard technology
    • Supports IPsec for data encryption and authentication
    • Supports RSTP/Turbo Ring redundant protocols to enhance reliability
    • Dual WAN redundant interfaces establish a reliable Internet backup connection
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  • Secure Remote Maintenance

    Cellular Site-to-Site VPN Tunnel

    • Secure remote access using a VPN
    • Supports IPsec and OpenVPN for data encryption and authentication, which increases flexibility and security
    • Compliant with ATEX Zone 2 and the IECEx standard
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Secure Interconnected Traffic Signal Communications via a Public Network

  • Moxa’s EDR-810-VPN Series provides up to 10 ports to connect LAN devices
  • 17 Mbps VPN bandwidth for VPN tunneling between field cabinets and the central operation center
  • Two Gigabit fiber ports with RSTP and Turbo Ring technology for future expansion, where fiber-optic ring topology is preferred
  • Dual redundant power inputs to maximize system uptime
  • NEMA TS2 compliant
Secure Remote Monitoring of Gas Transmission Stations Along a Pipeline

  • Moxa’s EDR-G903 Series provides a high-performance VPN with data rates up to 150 Mbps in order to process large amounts of data
  • Our EDR-G903 provides up to 350 NAT rules for all 100 stations with a single configuration file for easy management
  • Built-in Modbus TCP deep packet inspection to provide protection for unsecured Modbus communication
Secure Cellular Communication for a Water-Treatment Application

  • Moxa’s OnCell G3150A-LTE provides multiple VPN tunnel options for secure and reliable communication over a cellular network
  • Industrial networking devices that adhere to the relevant guidelines of the IEC 62443 standard for increased cybersecurity protection
  • The LEDs on the front panel of the OnCell G3150A-LTE indicate the current signal stream and cellular mode status