Nagios : CRITICAL – Could not interpret output from ping command

Nagios

Host Status:
DOWN
(for 0d 0h 48m 36s)
Status Information:
/bin/ping -n -U -w 30 -c 5 67.15.225.4
CRITICAL – Could not interpret output from ping command

solusi :
root@concat [/usr/local/nagios/etc]# ls -al /bin/ping
-rwxr-xr-x 1 root root 35864 Dec 21  2006 /bin/ping*
root@concat [/usr/local/nagios/etc]# chmod u+s /bin/ping
root@concat [/usr/local/nagios/etc]# ls -al /bin/ping
-rwsr-