Cyber-Ark
For those of you using the Cyber-Ark enterprise password vault appliance, be sure to set your Orion Network Performance Monitor ICMP payload to exactly 32 bytes. Cyber-Ark doesn't allow any protocol traffic in/out except its own, so while SNMP is out a Cyber-Ark will answer up to an ICMP packet of 32 bytes.
Additional details
support.us@cyber-ark.com