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NETRJS Remote Job
Port 71 is historically used for the NETRJS (Remote Job Service), primarily designed to facilitate remote job entry and processing on mainframe systems. It allowed users to submit, manage, and receive output from batch processing jobs remotely over a network connection..
Port 71 is associated with the NETRJS - Remote Job Service protocol developed during the era of mainframe computing. It was primarily employed in IBM mainframes and related systems, enabling remote terminals or client systems to submit batch processing tasks to centralized computing resources. This streamlined workflows by decoupling job scheduling and resource use from physical presence.
Functionally, NETRJS operated over TCP, creating a reliable connection between a client terminal and the mainframe service. Users could upload job control language (JCL) files, receive printouts, and manage job execution status through a standardized interface. This facilitated efficient workload management, especially in large organizations that relied heavily on mainframe batch processing.
While modern enterprise IT has largely transitioned away from such protocols to more streamlined management tools and APIs, the NETRJS service remains a part of legacy network protocol documentation. Usage today is rare, and often exists only in niche environments or in emulations of older systems.