I am still trying the free version of PRTG to see if it fits my needs. The issue I am having is the sensors are constantly disconnecting and sending out alerts. Constantly on my servers PRTG reports:
"The host's WMI system is returning invalid data: in class Win32_LogicalDisk - c: FreeSpace c: Size d: FreeSpace d: Size e: FreeSpace e: Size (PE098)"
I have tried searching online and yet to find anything that solves this issue.