[Nagiosplug-help] Problem with using check_ping sometimes; pipe problems

[Sebastian Berm]

Hi,

First of all, I don't know how active this list exactly is etc, as I just
subscribed. So I'm still a bit glowing green ;).

Since about 2 weeks I'm using Nagios to monitor about 50 servers for the
company I currently work for. But I've got a problem with just one tiny
thing I can't seem to be able to fix.

Most of the ping tests work great, however there are some that start
flapping for no reason. Sometimes it works, sometimes I get back an error.

Service Ok[13-02-2006 09:39:18] SERVICE ALERT:
mysql2-t83;PING;OK;SOFT;2;PING OK - Packet loss = 0%, RTA = 137.67 ms
Service Unknown[13-02-2006 09:38:18] SERVICE ALERT:
mysql2-t83;PING;UNKNOWN;SOFT;1;Could not open pipe: /bin/ping -n -U -w 20 -c
1 212.29.xxx.xxx
Service Ok[13-02-2006 09:36:18] SERVICE ALERT:
loadbal-ip2-t74;PING;OK;SOFT;2;PING OK - Packet loss = 0%, RTA = 137.40 ms
Service Unknown[13-02-2006 09:34:18] SERVICE ALERT:
loadbal-ip2-t74;PING;UNKNOWN;SOFT;1;Could not open pipe: /bin/ping -n -U -w
20 -c 1 212.29.xxx.xxx
Host Up[13-02-2006 09:34:18] HOST ALERT: loadbal-ip2-t74;UP;HARD;1;PING OK -
Packet loss = 0%, RTA = 137.76 ms

I keep getting the 'Could not open pipe' errors at random intervals.

Does anyone perhaps know why this happens ?
The firewall configured for this, will allow all traffic from and to the
server that's using nagios.

With kind regards,

-- 
Sebastian Berm