When a machine is on another continent, remote access is no longer a nice extra. It is how support teams cut downtime, avoid costly travel, and keep production moving when no one can get on-site fast enough.
The problem is simple and easy to miss. A remote access device can look secure because the login is encrypted, yet still give one user far too much reach after they get in. That is where remote access devices either protect your system or quietly put it at risk.
Table of Contents
Why remote access helps, and where it can go wrong
When machines are far away, remote access becomes a lifeline
Machine builders have dealt with this for years. A system ships to Africa, Asia, Eastern Europe, or any site that is hard to reach, and the support clock starts the moment something goes wrong. A bad sensor, a PLC setting, or a network issue can stop production fast. Without remote access, the fix may depend on flights, visas, local contractors, or long delays.
That pressure grew after the pandemic, when travel became harder and many teams had to support more machines from home or from smaller field groups. In that setting, remote access is practical. It shortens response time and keeps experts connected to sites they may never visit in person.
It is also why so many teams now look for products built for secure remote control for industrial automation. The need is real, and it is not going away.
The hidden cost of convenience in control systems
Remote access saves time because it removes distance. At the same time, it can also remove boundaries if the setup is weak.
A remote login should not act like a master key. Yet that is often what happens. One approved user can end up with access to every device on a machine network, multiple PLCs, and any tag or setting those devices expose. The connection feels small on the outside, but once it lands inside the network, the reach can become huge.
That is the tradeoff at the center of industrial remote access. Speed is good. Broad, uncontrolled reach is not.
What Ewon gets right
A clean interface, SSL, and OpenVPN make it easy to trust
Ewon is popular for good reason. It has been around for a long time, and many controls engineers already know how it works. The graphical interface lowers the barrier to setup, which matters when a support team needs to move fast and does not want to fight the tool before fixing the machine.
The security basics are also solid. Ewon uses SSL, so the traffic is encrypted, and it uses OpenVPN, which many people already trust for remote connectivity. In plain terms, that means the connection itself is built on familiar, well-known methods rather than improvised shortcuts.
The device also brings the kind of practical options field teams like. Wi-Fi and cellular support help when wired network access is limited. An SD card helps with storing or moving configuration data. That mix is one reason Ewon has stayed common in machine support work.
The discrete input is one of its smartest ideas
The standout feature is the discrete input. It sounds small, but it changes the way access is granted.
A plant can wire that input to a switch, so a person on-site must enable remote access before anyone connects. That means a remote session cannot start unless the people at the machine allow it. In real shops, that matters. It adds a physical step, and physical steps often stop careless access better than software menus do.
Still, Ewon is mainly a remote access tool. Once the user is inside, the control of what happens next may not be tight enough for every plant. The tunnel is secure, but the destination may still be too open.
How the Red Lion RA70K changes the discussion
Wireless options, alerts, and storage make service work easier
The Red Lion RA70K is another strong option, and it brings a few extras that many teams will notice right away. Like Ewon, it offers a graphical interface and SSL-based security. In this comparison, it is positioned as using IPsec rather than OpenVPN.
The practical features stand out. Wi-Fi and cellular options help when the machine is in a hard-to-wire spot. Email and text alerts add another layer of usefulness because the device can report trouble instead of waiting for someone to poll it. That can shave time off a service response.
It also supports SD card and USB storage. That matters more than it sounds. During setup or recovery, being able to move files or save configuration locally can make a rough service call much less painful. For a related example of remote file handling, this guide to SFTP remote file management shows why secure file access matters once equipment is reachable over a network.
If wireless connectivity is part of your support plan, it also helps to look at optimizing panel server Wi-Fi for remote monitoring, because signal quality often decides whether remote support feels smooth or frustrating.
Better debug tools can save hours
Where the RA70K pulls ahead is troubleshooting. Its debug tools are a big advantage. Ping, traceroute, and similar diagnostics can save a technician a long back-and-forth when the problem is not the PLC logic, but the path to the PLC.
That matters most on distant sites. If the machine is hard to reach, the best tool is often the one that helps you prove whether the fault is routing, addressing, or the device itself. The RA70K also uses a key switch instead of a discrete input, which gives the same basic benefit as Ewon’s physical enable method. Someone local has to turn access on before a remote user gets in.
A quick comparison makes the tradeoff easier to see.
| Device | Notable strengths | Main control feature | Main concern |
|---|---|---|---|
| Ewon | GUI, SSL, OpenVPN, Wi-Fi/cellular, SD card | Discrete input | Login can expose too much of the network |
| Red Lion RA70K | Alerts, USB/SD, strong debug tools, Wi-Fi/cellular | Key switch | Login can expose too much of the network |
| ICS Defender | Remote access, NAT, firewall, DPI | Rule-based access limits | Higher upfront cost |
The table shows the pattern. Ewon and RA70K are useful, capable tools. The bigger issue sits behind the login.
The real risk starts after someone gets in
Phishing can turn one password into a plant problem
Many buyers focus on how a device authenticates users. That matters, but it is only half the story.
If an attacker steals valid credentials through phishing, they do not need to break the encryption. They log in as a trusted user. At that point, the remote access device may treat them like any other approved person. The system does not know whether the password came from a service engineer or a fake login page.
A secure tunnel is only half the job. If the tunnel lands inside a flat network, one stolen password can reach far beyond the intended target.
NAT alone is not a security plan
NAT can be useful. It remaps addresses, which helps connect devices across network boundaries. But NAT is an addressing tool, not a full security control.
That distinction gets lost all the time in industrial setups. A PLC might sit on one subnet with a local address, while the outside world sees it through a different mapped address. If someone knows that outside address and can reach the enterprise network, they may gain direct access to the PLC behind it.
That is why NAT on its own is not enough. A good breakdown of the difference appears in NAT vs router vs firewall in OT networks.
A flat path into the network can open every device behind it
Picture a machine network with one PLC and a row of other devices behind the same remote access point. Once the user connects, what stops them from talking to every device on that segment?
In weak setups, the answer is “not much.” A user can reach the PLC, read the full data table, write tags, change modes, upload or alter configuration, and send commands. The same session may also reach drives, HMIs, or other controllers on the same network.
That is the warning tied to switch-based NAT features too. A switch may offer NAT because it is convenient. Convenience is not the same as protection. If the feature forwards traffic but does not restrict what the user can do next, it creates a hole in the manufacturing system instead of a barrier.
Firewalls and deep packet inspection make remote access safer
A firewall can limit access to only the intended device
A firewall changes the rules after login. Instead of saying, “you are in,” it says, “you may reach this one device, and nothing else.”
That is a big difference. If a remote user only needs the PLC, the firewall can block access to every other device on the machine network. The person gets the path required for the job, but not a free walk across the whole control system.
In practice, that kind of rule is what separates access from control. A login without limits trusts the user too much. A firewall assumes people should only see what their job requires.
Deep packet inspection can limit the action, not only the path
Deep packet inspection, or DPI, goes one step further. It does not only check where traffic is going. It also checks what the traffic is trying to do.
That matters when an application should read a few tags and nothing more. If a quality app only needs tag 1, tag 2, and tag 3, DPI can allow those reads and block requests for tag 4 or a write command. The session stays useful, but the dangerous parts stay closed.
For industrial environments, that level of control fits the job better than wide-open trust. Cisco makes a similar case in its industrial operations security white paper, which explains why built-in security functions matter on plant networks.
Security works best when the rules match the role. Maintenance, quality, and vendor support do not all need the same rights.
Why ICS Defender is the stronger answer
It combines remote access with tighter control
The strongest case in this comparison is for ICS Defender. The reason is not that it offers remote access alone. The reason is that it combines remote access and NAT with the controls that reduce the damage a bad login can cause.
The device is positioned as having the remote access features people expect, including OpenVPN-based access, while also adding a built-in firewall and deep packet inspection. That puts it in a different class from tools that stop at secure connectivity.
For plants that need remote support but also need firm boundaries, that mix matters. You are not only deciding how someone connects. You are deciding what they can touch after they arrive.
The higher price buys a different level of protection
The cost is part of the decision. ICS Defender is described as more expensive, and that should be said plainly.
Still, the price question is not only about the hardware. It is also about the risk of a bad connection model. If a stolen credential can reach every device behind one remote access gateway, the savings from a cheaper unit can disappear fast. Lost production, altered settings, or a security event will cost more than the difference in purchase price.
The real choice is simple. Some remote access devices give you access. ICS Defender is presented as giving you access with control.
Final thoughts
Remote access is now part of normal machine support. It keeps people connected to far-away equipment and cuts the delay that comes with travel, shipping, and site access.
But staying protected with remote access devices means asking a harder question than “Can I log in?” The better question is, “What can this user reach and change after login?” That is where firewalls and deep packet inspection earn their place.
Review your current setup before a problem forces the issue. If one password can reach more than one intended device, or more than one intended action, the design needs tighter limits.
