A VPN connection is set up between Site-A and Site-B, but no traffic is passing in the system log of Site-A, there is an event logged as like-nego-p1-fail-psk. What action will bring the VPN up and…

While an IKE gateway profile version mismatch can cause Phase 1 failures, the specific log message `ike-nego-p1-fail-psk` points to a pre-shared key issue, not a version mismatch.

Changing the IKE exchange mode to aggressive would not resolve a pre-shared key authentication failure, as indicated by the specific log message.

Enabling NAT Traversal addresses scenarios where VPN peers are behind NAT devices, and its absence would typically manifest with different log messages related to connection or encapsulation issues, not a specific pre-shared key failure.

The log entry `ike-nego-p1-fail-psk` explicitly signifies that the IKE Phase 1 negotiation failed due to a pre-shared key mismatch. To resolve this, the pre-shared key on Site-B's IKE Gateway profile must be updated to precisely match Site-A's, enabling successful authentication and VPN establishment.