How does ProFTPd live behind NAT on the Plesk panel?

Question

linux

What used to be the FTP server 175.149.11.09 in the Plesk panel
is now the server with the address 10.10.11.3 with the port forwarded to the outside.

MasqueradeAddress 175.149.11.09

Maybe this? ProFTPd does not understand this: panel policy does not allow specifying in configs
(until the first restart)

When saving the current settings and with the following rule:

iptables -t nat -I PREROUTING -p tcp --dport 721 -j DNAT --to-destination 10.10.11.3:21

ProFTPd swear in such an intricate way:

proftpd[12905] 127.0.0.1: fatal: Socket operation on non-socket

Answer 1

EvilMan : It looks like you are running proftpd through the inetd superserver. Configure proftpd for standalone mode using the ServerType standalone directive.