We have about a dozen XG's deployed. Most of them are physical with a couple of VMs as well. I have a LibreNMS server configured to monitor all of our client firewalls which has worked very well with the SonicWALLs that we support and seemingly fine with SFOS 17.0.6 or 17.0.8.
Things changed when I started upgrading to 17.1.1 MR-1. We started getting false positives that the firewall was down, usually it would fail a single check, then the subsequent check 5 minutes later would succeed and report the XG was online. Checking the firewall itself and discussing with our clients we could confirm that the firewall had never actually gone down. This was a relatively minor nuisance, but needed resolved. On it's release I upgraded a couple of the XGs to 17.1.2 MR-2 which appeared to resolve the problem on those two devices so I started upgrading all of the 17.1.1 MR-1 devices to 17.1.2 MR-2.
Fast forward to today, I have 7 of our XGs running 17.1.2 MR-2. Four seem to behave normally and three of those randomly stop responding to SNMP completely. A reboot fixes the problem but isn't a practical fix for obvious reasons. The three that I have trouble with are a mix. One XG125, one XG135, and a Hyper-V VM. The firewalls continue to work normally and respond to pings, but LibreNMS shows them down and attempts to snmpwalk from the NMS server time out. I haven't found anything helpful in the logs so far.
I'm curious if anyone out there has seen SNMP issues with the 17.1.x releases or might have any insight into what's going on here. Thanks!
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