since some days an IKEv2 connection to one of our customers fails.
It seems that we send requests to their firewall and they also answer, but for some reason our firewall can't parse the answer.
We have an Cisco ASA 5525 and on the other side there is a checkpoint firewall used.
The configurations for phase 1 and 2 on both sides are the same and were, at least on our side, not changed.
We and also the customer have other vpn connections wich work fine.
Attached you find a 255 debug of our ASA, maybe someone here can tell me what the problem is.