IKE failure on VPN between checkpoint and OCI

[dhueber]

Dear all,

we are currently trying to configure a VPN between our on-prem checkpoint cluster and Oracle Cloud Infrastructure (OCI).

On OCI side the tunnel is shown as up and on the checkpoint console, I do see an IKE SA as well as an IPSec SA.
However when trying to run and SSH, nothing goes through, even if the package looks good:

When looking to the VPN blade logs after deleting the SAs for this gateway, I can see following error message:

Any idea where it could come from or how I could get more information?

Many thanks

David