Recently while I am trying to setup Nagios on Ubuntu 14.04 OS I got the error saying /bin/ping Unknown status.
After debugging a wile I got to know that, this issue is because of permissions for /bin/ping script.
To resolve this issue just run following command ( use root or sudo):
$ chmod u+s /bin/ping
After running above command /bin/ping script permissions look like below:
$ ls -l /bin/ping
-rwsr-xr-x 1 root root 44168 Mar 15 2014 /bin/ping*