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Why does PRTG write error messages into my SonicWALL log?

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I monitor my SonicWALL via SNMP. But every time that PRTG queries the SonicWALL with SNMPv3, an error message appears in the logs of the SonicWALL. The message is “Invalid SNMP packet” with the note “Invalid engineID: 0”.

Why do the SonicWALL sensors cause this error message in the logs? Is there something wrong with my Network Security Appliance?

error-messages log-entries logs nsa prtg snmp sonicwall

Created on Oct 30, 2014 1:31:30 PM by  Gerald Schoch [Paessler Support]

Last change on Jan 31, 2019 8:22:27 AM by  Brandy Mauff [Paessler Support]



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This article applies to PRTG Network Monitor 14 or later

Monitoring of SonicWALL and Log Entries

If you monitor your SonicWALL Network Security Appliance (NSA) with the SNMP SonicWALL System Health sensor or with the SNMP SonicWALL VPN Traffic sensor, you might see some warning or error messages in the web interface of the SonicWALL like this:

MessageNotes
Invalid SNMP packetInvalid engineID: 0

This behavior is quite common if the engine ID of the SNMP agent is still unknown. It is part of the engine ID discovery, so don’t worry about these SonicWALL log entries. The SNMP packets are not malformed although they appear as warnings.

The log entries should stop automatically after a while, usually after all SNMP DLLs were used at least once.

Standard Approach

Querying the SonicWALL via SNMP works like this if the engine ID is unknown:

  1. Monitoring system (here: PRTG) sends a query to the SonicWALL without an ID.
  2. The SonicWALL returns an error message to the querying system (here: PRTG) with the correct ID and logs this event.
  3. Monitoring system (here: PRTG) sends a query with this correct ID.

PRTG has to follow this approach to get data from the SonicWALL. We cannot change the resulting log entries in the SonicWALL. It does not implicate a malfunctioning system, so you can ignore these messages.

Created on Oct 30, 2014 1:38:26 PM by  Gerald Schoch [Paessler Support]

Last change on Jan 31, 2019 8:22:52 AM by  Brandy Mauff [Paessler Support]



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Hello.

How long will this message appear?

Created on Sep 13, 2017 7:30:24 AM by  RBUCH (0)



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Hi,

Whilst being unfamiliar with the Sonicwall and its logging behavior,
you can seemingly filter the log window via the following guide at SonicWall.

Let me know if that worked!


Kind regards,
Stephan Linke, Tech Support

Created on Sep 13, 2017 7:16:27 PM by  Stephan Linke [Paessler Support]



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.