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