SNMP Unknown Error or Could not query SNMP value

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SNMP agents often will not respond at all unless you contact them with the information that they expect.

Check the following:

  • The SNMP Version is supported by the agent.
  • If using SNMP v1 or v2c, the correct community string must be specified.
  • Ensure the default ports are open on your firewall
    • SNMP uses the default UDP port 161 for general SNMP messages (WebWatchBot uses this to query SNMP on a remote machine)
    • SNMP uses the default UDP port 162 for SNMP trap messages (WebWatchBot may use this port if sending an SNMP Trap)