Hello

I have a problem with SNMP Traffic Sensor that occurs to a lot of my routers.

  1. When I click on Add Sensor and then select SNMP Traffic Sensor, I get the page with all the interfaces of my router.
  2. I select a specific interface and click on Continue.
  3. Everything seems ok, but after a few seconds I get the error:
#N SNMP_EXCEPTION_NOSUCHINSTANCE

If I do a snmpwalk/snmpget I get the correct values. If I use the Paessler SNMP Tester I get no error. I can monitor this specific interface with other tools like MRTG without any problem.

So I don't understand why I get this error with PRTG.

Any idea?

Thank you very much

Article Comments

Attention: This article is a record of a conversation with the Paessler support team. The information in this conversation is not updated to preserve the historical record. As a result, some of the information or recommendations in this conversation might be out of date.

Hello there,
we appreciate your contact.

There are three things worth checking:

  1. When deploying the sensor, are you selecting any of the "Additional Channels"? (Errors, Discards, etc). If your device or the specific selected interface doesn't support this additional counter, you will get an NOSUCHINSTANCE exception, that's the device telling PRTG it doesn't support the polled/queried OID.
  2. What precise PRTG version are you running? Please make sure that you're either running version 17.x.33 or version 18.x.38. You may encounter random issues when deploying SNMP Traffic sensors in the versions in between. Please update to 18.x.38 to be sure.
  3. Lastly, make sure that you're using a valid Port Name Template and Port Identification in the SNMP Compatibility options of the parent device (were you're trying to deploy the sensors) :
    1. Update Sensor Name when Interface Description Changes

Should the issue persist, I kindly ask that you follow-up via a support case and reference case PAE1011201).

Best Regards,
Luciano Lingnau [Paessler Support]


Mar, 2018 - Permalink

Hello

Thanks to your suggestions, I found the additional channels were not supported by specific interfaces (ATM like)

Thank you very much!

Best Regards Luca


Mar, 2018 - Permalink