I have a site to site VPN ( Checkpoint to checkpoint, IKEv2 only). A few days ago, everything was working fine. but since yesterday, traffic is ok in one way, and it's dropped by the firewall for the other way, with the error message below:
Enryption Fail Reason: "Packet is dropped because there is no valid SA - please refer to solution sk19423 in SecureKnowledge Database for more information"
I've checked the configuration, everything looks fine. The fact that is work one day and stopped working the next can't be a config issue..I think..
Does anyone have any idea what might be the root cause ?