Hello, I installed ISPConfig 3 on my Debian Buster. I created a server and activate the pureftpd. Then I create a ftp user and try the connection from internal. Everything work fine. Then I try the connection via ftp. I get the welcome message. I could login in with the ftp commands user and pass. Then I typed in the EPSV command. I need this, because my costumer has a proxy in front of his network. I only get the error 500 Command Unknown. Then I typed in FEAT to see the feature list. I see thet EPSV ist listed, but it does not work. I try the same on an Debian Buster which ist manually installed. The EPSV command work. So maybe it is only a wrong setting in ISPConfig.