If you think ftp work with another port on Kloxo official, that mean watchdog not work.
Again, it's because watchdog detect ftp via port 21. You can change port in watchdog inside /usr/local/lxlabs/kloxo/etc/watchdog.conf.
You can see:
s:4:"port";s:2:"21";s:6:"action";s:26:"/etc/init.d/xinetd restart"
If want change port 21 to 21000 you must change to:
s:4:"port";s:5:"21000";s:6:"action";s:26:"/etc/init.d/xinetd restart"