Site2Site IPSEC VPN Tunnel (Opensense to Sonicwall)

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Dear all,

I am working to setup a IPSEC VPN Tunnel between Opensense (Site A) and Sonicwall TZ270 (Site B).

Unfortunatley the tunnel comes not up.

Error on Sonicwall:

IKEv2 Payload processing error
VPN Policy: LCI VPN; Type: KEY Payload

Error on Opnsense LOG:
parsed IKE_SA_INIT response 0 [ N(INVAL_SYN) ]
received INVALID_SYNTAX notify error

But if I configure IKE V1 (with main mode) instead of IKE V2, the tunnel comes up.

Are the any known issues? What could I do?

thanks in advance.

best regards,
michael

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Settings Part 2....

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Settings Part 3