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Port 657IBM RMC

IBM RMC (Remote Monitoring and Control) is a proprietary IBM protocol primarily used within IBM Power Systems environments. It enables the communication between the Hardware Management Console (HMC), Integrated Virtualization Manager (IVM), and logical partitions (LPARs), facilitating dynamic partition management and monitoring. This protocol is vital for resource allocation, hardware status updates, and remote configuration within enterprise IBM systems, supporting efficient virtualization and system management..

inNetwork ServicesSystemVirtualization
transport
tcp · udp

2 transports registered

in transit
cleartext

payload readable on path

assignment
official

registered with iana

risk
4/10

caution

lookups
9,968

rank 470 of 993 · top 47%

Technical Details

what runs on :657

IBM RMC (Remote Monitoring and Control) is a specialized protocol designed to facilitate management operations within IBM Power Systems, especially in conjunction with IBM's System p5 architecture. It allows remote monitoring, hardware configuration, and dynamic partition management by linking the Hardware Management Console or Integrated Virtualization Manager with the logical partitions (LPARs) running on IBM's servers.

RMC operates over both TCP and UDP on port 657 to provide reliable delivery of control commands and monitoring data. The protocol handles a variety of management tasks, such as starting and stopping partitions, reallocating system resources, collecting health metrics, and synchronizing status among hardware and virtual components. It is tightly integrated with IBM's virtualization stack and management software.

Its integration enables administrators to perform actions dynamically with minimal disruption. RMC's capabilities are essential within virtualization environments for achieving seamless scalability, optimizing hardware utilization, and supporting high availability by allowing rapid reconfiguration.

Security Information

exposure of :657

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

network services averages 3.9 across 604 ports — this one sits 0.1 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

official

registered with iana for this service — scanners fingerprint it by number

reachable over

tcp · udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

From a security perspective, IBM RMC relies on the underlying network infrastructure but traditionally lacks advanced built-in encryption, making it potentially vulnerable if exposed outside secured internal networks.

Common vulnerabilities include:

  • Unauthorized access through poorly secured management interfaces
  • Eavesdropping on unencrypted management traffic
  • Exploitation of default or weak authentication configurations
  • Abuse of RMC functions to disrupt virtualization or hardware operations

Common mitigations involve:

  • Restricting RMC traffic within isolated administrative VLANs
  • Employing strict role-based access controls on all management consoles
  • Utilizing firewalls and access control lists to limit network exposure
  • Wrapping RMC sessions in encrypted tunnels such as VPNs when crossing unsecured networks
  • Regularly auditing LPARs and management systems for unauthorized changes and vulnerabilities

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risk mix of the 8 listed

  • caution100%

0 of 8 encrypted