Our monitoring system detected a short drop of connectivity to the management interface of one of our VSX chassis cluster members.
When I checked the logs, I saw that the snmp and ping requests were dropped by the gateway with informational message "IP routing failed (ipin routing failure)".
I've never come across such a message before and could not find any article online on what might have caused this.
The normal communication was fully restored a few mintes later on its own and even in the meantime, some packets were handled normally and accepted by the firewall.
I was wondering whether someone can suggest how to troubleshoot this as we want to avoid having a bigger problem at some point later by ignoring this now.