Exam PCNSE topic 1 question 297 discussion

Answer is C. IKE phase-2 negotiation failed when processing Proxy ID. The VPN peer on one end is using a policy-based VPN. You must configure a proxy ID on the Palo Alto Networks firewall to identify the VPN peer.

protocol 0 and port 0 gives it away... proxy ids should match on both the ends

C. Mismatched Proxy-IDs. The log message indicates that there is a mismatch between the local identification IP address (10.10.1.4/24) and the remote identification IP address (10.1.10.4/24) in the VPN system. This mismatch suggests that the Proxy-IDs configured on both ends of the VPN tunnel do not match. Proxy-IDs are used in IPSec VPN configurations to define the traffic that should be encrypted and protected within the VPN tunnel. Both ends of the VPN tunnel must have matching Proxy-IDs to establish a successful VPN connection and ensure proper encryption and routing of the specified traffic.

Summary Palo docs.. When a PA firewalls sets up IPSEC tunnels with a device as Plicy based VPN, the other end defines differenct parameters as Proxy IDs whereas on PA they are set to the default values of 0.0.0.0/24.

C 10.10.1.4/24 vs. 10.1.10.4/24 --> Proxy-IDs are mismatched

https://docs.paloaltonetworks.com/pan-os/10-2/pan-os-admin/vpns/set-up-site-to-site-vpn/interpret-vpn-error-messages

C is correct https://docs.paloaltonetworks.com/pan-os/9-1/pan-os-admin/vpns/set-up-site-to-site-vpn/interpret-vpn-error-messages