I’ve recently ran into an issue where I’m using IKEv2 preferred and the two firewalls are using different versions of PAN-OS. It will fail with “invalid sig.”. If both firewalls are the same PAN-OS version (this has been happening on 9.1.11-9.1-13h3… I don’t have any other versions to test), it works fine. But since I can’t update all firewalls at the same time, there are periods of time where they are different versions and that results in the tunnel dropping.
Additionally, as I’m using IKEv2 preferred, I assumed that when IKEv2 failed, it would use IKEv1 but that doesn’t seem to be the case.
Are both of these expected behaviors? There must be something I am missing.
I don't know the exact detail of the implementstion of "IKEv2 preferred" but I only had issues with this in the past. I recommend you to use IKEv2 only. Once the tunnel is successfully connected it will not suddenly fail to establish and then do a fallback to IKEv1. If it really fails in such a situation, then it probably is because of an (unlikely) MITM attack.
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