http://linux.tnc.edu.tw/techdoc/proftpdfaq-full.htm

4.18 Error 421

This appears to be a general catch all error code meaning 'something nasty has gone wrong'.

* Connection has timed out
* The DefaultRoot specified doesn't exist
* The parent server has been killed
* Check /etc/services
* Wrong permissions on the DefaultRoot

You get the idea...
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