Prisma SD-WAN has supported dynamic probing for TCP applications when it detected 3-way handshake failures. The ION device generates these dynamic probes to verify whether a destination service is up or down on that path. If verified as down, the ION device avoids sending additional user requests for the service on the specific path, while continuing to generate synthetic probes to detect any change in service reachability.

Starting with Release 6.3.2, Prisma SD-WAN supports this functionality for UDP DNS traffic along with DNS health visibility also.