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BackWhat is Remote access to OT?
Remote access to OT refers to the ability to securely connect to and manage operational technology (OT) systems from a remote location. It enables engineers, operators, vendors, and maintenance teams to monitor, troubleshoot, configure, and maintain industrial systems without being physically present at a facility.
Remote access plays a critical role in industries such as manufacturing, oil and gas, energy, water treatment, transportation, and utilities. It reduces downtime, speeds up troubleshooting, and allows specialists to support multiple facilities from a central location. However, because remote connections provide access to industrial control systems, they also introduce cybersecurity risks that must be carefully managed.
Why remote access matters in OT
Industrial environments often operate continuously, making rapid maintenance and troubleshooting essential. Remote access allows experts to diagnose issues and perform maintenance without waiting to travel to the site.
Remote access OT helps organizations:
- Reduce equipment downtime.
- Enable remote maintenance and troubleshooting.
- Improve operational efficiency.
- Support vendors and third-party service providers.
- Minimize travel costs and response times.
- Maintain business continuity across multiple sites.
Without appropriate security controls, however, remote access can become an entry point for cyberattacks targeting industrial environments.
Common remote access methods
Organizations use different technologies to provide secure connectivity to OT environments.
| Remote access method | Purpose |
|---|---|
| Virtual Private Network (VPN) | Provides encrypted remote connectivity to industrial networks |
| Secure remote access gateways | Control and monitor remote OT sessions |
| Jump servers | Act as controlled intermediaries between IT and OT networks |
| Remote desktop solutions | Allow authorized administrators to manage OT systems remotely |
| Zero Trust Network Access (ZTNA) | Grants access based on continuous identity and device verification |
The appropriate solution depends on the organization’s operational requirements and security policies.
Best practices for securing remote OT access
Remote access should be designed to minimize the risk of unauthorized access while maintaining operational availability.
| Best practice | Benefit |
|---|---|
| Enforce multi-factor authentication | Protects remote accounts from credential-based attacks |
| Segment IT and OT networks | Reduces lateral movement between environments |
| Apply least-privilege access | Limits users to only the systems they require |
| Monitor remote sessions | Improves visibility into administrator and vendor activity |
| Keep remote access systems updated | Reduces exposure to known vulnerabilities |
| Review third-party access regularly | Removes unnecessary or outdated vendor access |
Combining these controls helps organizations secure remote access without disrupting industrial operations.
How Hexnode helps secure remote OT access
Hexnode UEM helps organizations secure the Windows laptops, rugged devices, tablets, and engineering workstations used to remotely access OT environments. Administrators can configure VPN profiles on supported platforms, enforce device security policies, deploy operating system updates, manage approved applications, and monitor device compliance from a centralized console.
Hexnode XDR complements endpoint management by monitoring managed Windows engineering workstations and administrative endpoints for suspicious activity. It provides centralized visibility into threats and incidents and supports response actions such as endpoint isolation, helping security teams investigate compromised remote access devices before attackers can use them to reach industrial systems.
FAQs
No. Remote monitoring allows users to observe industrial processes without making changes, while remote access enables authorized users to interact with, configure, or administer OT systems.
Yes. Zero Trust Network Access (ZTNA) continuously verifies user identity, device posture, and access policies before granting access. This reduces the risk of unauthorized users reaching critical OT systems compared with traditional network-based access methods.
