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Final Update: Found the issue after several (many) piecewise im- and exports of the configuration between my specific settings (starting from 22.7.11) and the defaults of 23.x.

Interfaces -> (WAN interface) -> Override MTU is set by default.

In my case, taking the ISP settings (a Fritz Box before the Firewall) by unsetting the option solved the problem of loosing WAN connectivity during firmware upgrade!

There seems to be a change in the MTU settings/setup of OpenSense which leads to change in the behaviour of that option :-/

Cheers S.

ping on some interface works, on a fritz box "behind" wan interface of opnsense gives error as attached

Sorry, please excuse, my fault. Did recognise my current version too late.  :o

>  21.7.8 to 22.1

Ok, wasn't meant for that when posting in 23.1 forum ;) I'm not sure there will be much help anymore to get a 22.1 running. Better to try 23.1 but mind you FreeBSD 13 is the default since 22.1 which has caused a few things to change that "always worked" before because then the kernel was less strict.

If workaround suggested doesn't work it's likely another issue entirely and so we need more data points.


Cheers,
Franco

ping on some interface works, on a fritz box "behind" wan interface of opnsense gives error as attached

THX Franco, unfortunately no success - gateway still offline  :(

(see attachment)

PS just recognised: its an upgrade from 21.7.8 to 22.1 in my case

same observation, could not roll back yet but switched to a second device after the failure. can not communicate to wan interface after upgrade. ping, up to the wan interface, works.