After Migrating from an ASA firewall to a Palo Alto Networks Firewall, the VPN connection between a remote network and the Palo Alto Networks Firewall is not establishing correctly. The following…

Changing the IPSec Crypto profile to `no-pfs` (group 0) when the peer expects Group 2 would perpetuate the mismatch and not resolve the issue.

PFS (Perfect Forward Secrecy) group settings are configured in the IPSec Crypto profile, not the IKE Crypto profile. The IKE Crypto profile handles Phase 1 settings like authentication and encryption algorithms.

Changing the IKE Crypto profile from `group2` to `no pfs` is incorrect because PFS is an IPSec (Phase 2) setting, not an IKE (Phase 1) setting, and it would also incorrectly suggest removing PFS when the peer expects it.

The log message 'Pfs group mismatched: my:0 peer:2' explicitly states that the local firewall (my) has PFS group 0 (no PFS) while the peer expects PFS Group 2. Therefore, updating the IPSec Crypto profile on the Palo Alto Networks firewall to use Group 2 (e.g., DH Group 2) will match the peer's configuration and resolve the mismatch.