Hello all,
We've discovered that there is an undocumented dependency in NAV [1]. If you wish to use the service monitor's radius checker, you need to install the python module pyrad [2], AKA python-pyrad on Debian.
It seems the original developer of the radius checker plugin did not report this dependency when the plugin was submitted to NAV.
[1] https://bugs.launchpad.net/bugs/317028 [2] http://www.wiggy.net/code/pyrad/