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SNMP Error 2003 intermittently on same sensors

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Hello,

I've noticed that some of our SNMP sensors repeatedly give no response errors/warnings that I believe to be false negatives, and I was wondering if anyone had any ideas to alleviate this, as I feel these specific monitors aren't useful in any sense in their current state. I will note that these are Linux boxes that are giving the errors, and our Windows servers/clients have not had similar issues. It also seems to be the same devices every time. I'll attach some screenshots of our 2 hour graph to show just how intermittent it is.

Firewall WAN Traffic

Disk free sensor (1)

Disk free sensor (2 - same device)

Some things we have tried:

Shuffling devices to new remote probes for load balancing

Increasing the SNMP timeout to various amounts (I've tried anywhere from 5-60 seconds, but the devices fail to respond for minutes at a time, so I'd have to set realistically a 15 minute timeout to avoid 90% of these warnings and errors, which is far from ideal).

Any advice is greatly appreciated!

prtg snmp timeout

Created on Feb 21, 2017 3:03:22 PM by  bbarr91 (0) 1

Last change on Feb 22, 2017 12:12:32 PM by  Erhard Mikulik [Paessler Support]



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Hello there,

Everything you describe points to an issue with the SNMP implementation on the affected devices, especially the SNMP daemon seems to be "shaky" I'm afraid.

The sensors do the same job as on other devices where you don't experience these issues, so it does not appear to be a general issue in the network or with PRTG so far. Raising scanning intervals is a good approach with such "shaky" devices, also you can try making use of "SNMP Compatibility Options" located in the device's "Settings" tab in PRTG. Try setting an SNMP Delay and also give "Use Single Get" a shot. Another setting worth fiddling with is "SNMP Timeout" located in section "SNMP Credentials", also located in the device's "Settings" tab. Other than that you might find other resources pointing to what could be improved around the target host's SNMP configuration.

See also here our checklist for setting up SNMP on Linux.

Kind regards,

Erhard

Created on Feb 22, 2017 12:30:51 PM by  Erhard Mikulik [Paessler Support]



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I have a similar issue. I am starting to get these same SNMP errors and "dropouts" on a Sonicwall TZ300 firewall that has been working fine for over 2 months. I have a second identical firewall that is not having these issues. The main difference is that the "failing" firewall is on the other end of a VPN tunnel.

My PRTG host is a Windows 2012R2 VM.

Created on Jun 16, 2017 3:44:13 PM by  John Clarke (0) 1



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Hello trex1000,

Please find here what to do about intermittent SNMP dropouts on Sonicwall firewalls.

Kind regards,

Erhard

Created on Jun 19, 2017 7:07:45 AM by  Erhard Mikulik [Paessler Support]



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