Workaround for failing Juniper Network Connect in Yosemite

The current version 8.0.7 of Network Connect and the latest Yosemite 10.10.1 don't like each other: you simply can't connect.

A workaround (and it should be nothing more if you care) is to allow unsigned kernel extensions (which are unsupported/disabled in Yosemite by default):

sudo nvram boot-args="kext-dev-mode=1"

To revert this:

sudo nvram -d boot-args

Looks like this is also helpful for some other problematic extensions.