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Hello, 

i just had the same issue, due lack of time we couldn´t dive deeper into it. But no luck with IKEv2.
On CP side it always seems to work a tunnel was up.
SmartView Monitor said OK
"vpn tu tlist" said UP
Check Point seems to be able to send packets into the tunnel, but they were not received on OpenSense side.
Otherway around same issue. 


but i received message like this in SmartLog

"Auth exchange: Sending notification to peer: Invalid syntax"


regarding 
https://supportcenter.checkpoint.com/supportcenter/portal?eventSubmit_doGoviewsolutiondetails=&solut...
it should have to do with "Change Tunnel Management in Community from "One Tunnel Per Subnet Pair" to "One Tunnel Per Gateway Pair""
but no time to test it ...

changing to IKEv1 made it work.

plattform was  R81 + Take 23 plus "Encryption Domain Per community" feature.

perhaps someone go it running with IKEv2?

best regards

and also, R77.30 is end of everythig.