Blog Entry of 2009-Sep-30 in PRTG 7
What to Do When PING Sensors Show Astronomical or Negative Request Times in PRTG
We have received reports from customers about PING sensors that show very high (ten thousand milliseconds or more) or even negative request times. The reason for this behavior can be a known issue of Hyper-V that shows up when Windows Server 2003 is virtualized under Microsoft Hyper-V when a multi-core CPU is assigned to it.
Our latest Knowledge Base article "PING Sensors Show Very High or Negative Request Times in PRTG" explains why you might be experiencing such behavior, and how to resolve this issue.