Dell EMC OpenManage Essentials Version 2.5 User's Guide

Changing the default SNMP port

SNMP uses the default UDP port 161 for general SNMP messages and UDP port 162 for SNMP trap messages. If these ports are being used by another protocol or service, you can change the settings by modifying the local services file on the system.
  • NOTE: This section requires Support V1/V2c Traps to be selected in the SNMP Listener Settings under Settings > Alert Settings .

To configure the managed node and OpenManage Essentials to use a non-default SNMP port:

  1. In both the management station and managed node, go to C:\Windows\System32\drivers\etc.
  2. Open the Windows SNMP services file using Notepad and edit the following:
    • Incoming SNMP trap port (receiving alerts in OpenManage Essentials) — Modify the port number in the line, snmptrap 162/udp snmp-trap #SNMP trap . Restart the SNMP trap service and SNMP service after making the change. On the management station, restart the DSM Essentials Network Monitor service.
    • Outgoing SNMP requests (Discovery/inventory in OpenManage Essentials) — Modify the port number in the line snmp 161/udp #SNMP. Restart the SNMP service after making the change. On the management station, restart the DSM Essentials Network Monitor service.
  3. Outgoing trap port — In OpenManage Essentials trap forwarding alert action, specify the <<trap destination address: port number>> in the Destination field.
  • NOTE: If you have previously configured IP security to encrypt SNMP messages on the default ports, update the IP security policy with the new port settings.

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