OT Glossary

A dedicated, secure computer through which users must connect to access a different security zone. In OT, a jump host (or jump server) is often placed in the DMZ as a controlled point for remote access into the control network. Operators or vendors first remote into the jump host (which is hardened and monitored), then from there connect to the OT devices (HMIs, PLCs). The idea is to funnel all external access through one chokepoint that can be managed (with multifactor auth, logging, limited tools). This reduces the risk of direct remote connections into sensitive ICS and provides an audit trail of who did what.