Tavve zoneranger User Manual page 19

In addition to the primary audit process, as described above, the ZoneRanger appliance also includes a
secondary audit, which runs every thirty minutes. The goal of the secondary audit is to verify that the
primary audit is doing its job. If the secondary audit determines that the primary audit is no longer
functioning properly, the ZoneRanger appliance will be automatically rebooted. This two-layer audit
approach helps to ensure that ZoneRanger will continue to operate reliably, even when unexpected
software problems occur. Note that the Ranger Gateway does not include a comparable secondary audit,
because the Ranger Gateway software is typically installed on the same server as one or more
management applications, and users will typically prefer to keep these applications running, even if
Ranger Gateway problems are detected.
ZoneRanger 5.5 User's Guide 19