implementing-conduit-security-for-ot-remote-access

# Implementing Conduit Security for OT Remote Access ## When to Use - When replacing direct VPN connections from IT or vendors into OT control networks - When implementing IEC 62443-compliant conduit architecture for remote access paths - When deploying secure remote access for third-party vendor maintenance of ICS equipment - When building approval-based access workflows for privileged OT system access - When remediating audit findings about uncontrolled remote access to SCADA systems **Do not use** for designing the overall Purdue Model segmentation (see implementing-purdue-model-network-segmentation), for deploying IT-only remote access solutions, or for configuring local console access to PLCs. ## Prerequisites - IT/OT DMZ (Level 3.5) deployed with dual-firewall architecture - Jump server or privileged access management (PAM) platform (CyberArk, BeyondTrust) - Multi-factor authentication (MFA) infrastructure for OT remote access users - Session recording capability for compliance and forensic purposes - Approval workflow system (ServiceNow, ticketing) for access requests ## Workflow ### Step 1: Design Conduit Architecture for Remote Access ```yaml # IEC 62443 Conduit Security Architecture for OT Remote Access # All remote access terminates in DMZ - never passes through to OT directly conduit_architecture: remote_access_conduit: conduit_id: "RA-001" source_zone: "Enterprise IT (Level 4)" destination_zone: "OT DMZ (Level 3.5)" security_level_targe...