Nagios: CRITICAL - Could not interpret output from ping command

PING     UNKNOWN /bin/ping -n -U -w 10 -c 5 xx.xx.xx.xx

Nagios monitoring page showing above error when configuring in the client host ?

'Set-user-ID-on-execution permission' to fix the issue,

# ls -al /bin/ping
-rwxr-xr-x. 1 root root 40760 xxx xx  xxxx /bin/ping

# chmod u+s /bin/ping  // fix the issue.

# ls -la /bin/ping
-rwsr-xr-x. 1 root root 40760 xxx xx  xxxx /bin/ping

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