Error:

telnet 216.55.131.xx 21
Trying 216.55.131.xx…
Connected to 216-55-131-xx.dedicated.domain.net (216.55.131.95).
Escape character is ‘^]’.
216-55-131-xx.dedicated.domain.net proftpd[20885]: error: no valid servers configured
216-55-131-95.dedicated.domain.net proftpd[20885]: Fatal: error processing configuration file ‘/etc/proftpd.conf’
Connection closed by foreign host.

Simply run:

hostname yourservername.tld

or

nano /etc/hosts

Add

127.0.0.1 216-55-131-95.dedicated.domain.net

Restart ftp

service xinetd restart