When the /usr directory is on a separate partition the sisips driver fails to load.
MSTA,2,2015-09-11 12:14:05.906 Z+0100,C,90,,,10113,,,,,OpenDriver(),,F,,Driver Interace Operation,,,,,"Failed to open driver&sep1; 2"
This issue happens on Linux agents and is fixed in Data Center Security 6.6 MP1.
Upgrade to Data Center Security 6.6 MP1 or above