Nagios Support Forum

I am running into host check issue using the check_icmp command on a single windows host.
The check_icmp command fails however all the nrpe checks to the host continue to work fine.
I understand they are two different commands, but it shows that the host is reachable. The other behavior is that if I schedule an immediate check from the GUI it never runs, the "last check time" does not update. I ran the check_icmp command from the command line and it returns the correct performance information. A reboot of the nagios server clears the problem.

Any ideas what is causing this?
Should I be using something other then check_icmp to test if host is alive?

Thanks
Sal

A reboot of the nagios server clears the problem.

Do you mean that a reboot temporarily resolves the issue, or has the problem resolved itself?

The only thing I could think of that would be different from the command line to the UI is maybe there's an argument being passed from the UI that's throwing an error code. You're getting a "not a number (nan)" error message, so for whatever reason you're not getting a valid return code from the plugin, which might be why it's not updating the last check time. However, if this all magically goes away and fixes itself after restarting the server then it's that's going to be a little more tricky to diagnose.

For check_icmp, it's relatively common for firewall administrators to block that type of request - your best bet is probably to talk to your network people to see if any firewalls or the Windows box itself have been configured to deny you access to that.