After a few months after a PRTG update, I frequently receive false ping errors on PRTG, although I can ping the hosts directly from the PRTG server without issues. The errors usually resolve after 10-15 minutes.
You can usually resolve this issue if you ask the following questions:
- Is there an AntiVirus System installed on the same system?
If so, please disable it temporarily and observe if the behavior continues. Some anti-virus systems block automated ping requests. This could also be caused by a firewall. - Are only certain devices or sensors affected?
If so, then please open a command line on the PRTG core server and issue ping for two or three of the affected hosts with the following command:ping -t HOST
Disclaimer:
The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.
