We have several remote sites connected by T1 data circuits. Each site has a local server with a PRTG remote probe installed. I would like to measure the ping times to each location from the corporate headquarters. When I ping from a command prompt, results can be anywhere from 40msec to 400 msec, depending on how much traffic is traversing the line. However, all ping sensors in PRTG show a ping time of 0 msec. I've tried using both the DNS name and IP address. How do I get the correct values to show up?