[Nagiosplug-help] Error: Could not interpret output from ping command

[Tom DE BLENDE (GCC)]

Hi there,

I searched the archives, to no avail. This is what I get from check_ping 
when a host is down:

[root at gcclo77 libexec]# ./check_ping -H d3178oc1 40 80 100 900 -p5
/bin/ping -n -U -c 5 d3178oc1
Error: Could not interpret output from ping command

This is the ping command:

[root at gcclo77 libexec]# /bin/ping -c 5 d3178oc1
PING d3178oc1.gcc.dhl.com (10.30.2.251) 56(84) bytes of data.
 From gcclo77.gcc.dhl.com (10.30.15.77) icmp_seq=0 Destination Host 
Unreachable
 From gcclo77.gcc.dhl.com (10.30.15.77) icmp_seq=1 Destination Host 
Unreachable
 From gcclo77.gcc.dhl.com (10.30.15.77) icmp_seq=2 Destination Host 
Unreachable
 From gcclo77.gcc.dhl.com (10.30.15.77) icmp_seq=3 Destination Host 
Unreachable
 From gcclo77.gcc.dhl.com (10.30.15.77) icmp_seq=4 Destination Host 
Unreachable

--- d3178oc1.gcc.dhl.com ping statistics ---
5 packets transmitted, 0 received, +5 errors, 100% packet loss, time 
4018ms, pipe 4

Anyone a clue what is wrong? I'm using CentOS-3.

Thanks,
Tom