Ping Failing from collector to device and back?

19 minutes ago, Stuart Weenig said:

I get and agree that LM is causing the case, but if the firewall is eventually blocking the traffic, the firewall blocking the legitimate traffic (that looks illegitimate). Do you know the FR number?

It is no longer legitimate traffic after the "session" is invalid -- this is common firewall behavior that would be avoided by using a fresh ICMP ID for each ping check, like everyone else does.  

FR number?  When did that start being a thing?  I thought you just create them in the forum and cross your fingers someone sees them.  If feedback, then no, those are usually one-way -- I know tickets are generated internally because one of our CSMs actually shared them with me to help prioritize, but usually they are invisible with no followup (with one exception historically for API issues when Sarah Terry was there). The ticket ID for the last time I tried to get help on this is 107847 (last updated 7/23/2018).  The SNMP info above came from a more recent interaction by someone else on my team -- not sure of the ticket ID on that one.