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/

IIS ftp server can't access from other machine

https://serverfault.com/questions/438314/iis-ftp-server-works-locally-but-cannot-connect-from-remote

Basically, you have to run:

sc sidtype ftpsvc unrestricted

And then restart the FTP service:

net stop ftpsvc & net start ftpsvc

From what I can tell, it's a bug in R2. Go figure.