The Internet Key Exchange (IKE) daemon is attempting to initiate a narrow phase 2 Security Association (SA) for a new dynamic tunnel with a non-z/OS peer. The SA traverses a NAT. A narrow SA is an SA negotiated for specific ports, protocol, or both. Interoperability issues might exist with the non-z/OS peer when z/OS® initiates a narrow phase 2 SA. z/OS is providing NAT Traversal support for a defined group of configurations where z/OS is running the IKE daemon. See the information about IP security in z/OS Communications Server: IP Configuration Guide for a description of the supported configurations.