, ,

monit – FTP checks

 check host ftp.redhat.com with address ftp.redhat.com
       if failed icmp type echo with timeout 15 seconds
          then alert
       if failed port 21 protocol ftp
          then exec "/usr/X11R6/bin/xmessage -display
                     :0 ftp connection failed"
       alert foo@bar.com

References

1. https://mmonit.com/monit/documentation/monit.html