Non-ISAKMP Traffic Over Port 500/UDP

info Nessus Network Monitor Plugin ID 7212
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.


The remote host appears to be tunneling traffic.


The remote host has sent data over port 500 which does not seem to be valid ISAKMP traffic.


Manually inspect the system.

Plugin Details

Severity: Info

ID: 7212

Version: 1.1

Family: Policy

Published: 6/16/2016

Updated: 8/16/2018