vsftpd server not listing ( 425 Failed to establish connection)

Its kind of an off the wall solution but something I have run into on CentOS w/ vsftpd is problems with the ip_conntrack_ftp module not being loaded correctly causing this issue.

 Try this:

modprobe ip_conntrack_ftp

https://www.linuxquestions.org/questions/linux-server-73/vsftpd-server-not-listing-425-failed-to-establish-connection-4175414488/