when I ping at command line, it works but in prtg, it shows the system is down 'icmp error #1231'.

It was working almost without any error.

what can be the problem?

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Hello,

thank you very much for your KB-Post. PRTG uses a standard Windows API Call to ping targets. So it just passes the target IP / Hostname to Windows, and Windows then in turn returns the ping response times, or errors. So here, Windows passes back the "ICMP #1231"-error.
It is an odd error though, please try if the suggestions from the folioing MSDN-Threads help:

best regards.


Jun, 2014 - Permalink

It is working now!

Somehow the gateway ip was disappeared (i don't know how). Anyway it works and I appreciate your support.

Thanks,


Jun, 2014 - Permalink