ProFTPD access error 500

[Devon Harding]

About every 3 or 4 days, my ProFTPD service stops accepting
connections with the following message:

[root at mars proftpd]# ftp localhost
Connected to localhost (127.0.0.1).
220 FTP Server ready.
Name (localhost:root): jdoe
500  not understood
Login failed.
ftp>

I keep on having to restart the service to get it going.  Here is the output
in debug mode:

mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - FTP
sessionrequested from unknown class
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - AuthOrder in
effect, resetting auth module order
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - connected - local
: ::ffff:192.168.0.2:21
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - connected - remote
: ::ffff:192.168.0.20:1745
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - error setting
SO_OOBINLINE: Socket operation on non-socket
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - FTP session
opened.
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - dispatching
PRE_CMD command '' to mod_tls
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - dispatching
PRE_CMD command '' to mod_core
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - dispatching
PRE_CMD command '' to mod_core
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - dispatching
LOG_CMD_ERR command '' to mod_log
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - dispatching
PRE_CMD command '' to mod_tls
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - dispatching
PRE_CMD command '' to mod_core
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - dispatching
PRE_CMD command '' to mod_core
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - dispatching
LOG_CMD_ERR command '' to mod_log
mars.domain.com (pluto.domain.com[::ffff:192.168.0.20]) - FTP session
closed.
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