i have installed PRTG 188.8.131.5294 on a Windows 7 machine (VM on ESXi Host). Configured a DHCP Sensor on the Probe Device, but the sensor doesn't work. Error: Could not open UDP Port 68. Please make sure this port is not in use. (code: PE091)
But my DHCP server is working correctly in my network and there a enough IP's free.
On both machines (PRTG and DHCP server) the firewall is off. i played with the timeout setting is 10, 20 and 200 seconds, but no luck.
deleted the sensor and added a new with the correct network interface of the PRTG server, no luck.