Unable to connect to a Plesk server via FTP in the passive mode

Plesk for Windows kb: how-to Plesk for Linux ABT: Group A FR:PPM-1905

Applicable to:

It is not possible to connect to a Plesk server (or if connected, copy files) via FTP in the passive mode. One of the following error messages appears during connection (Error message varies depending on FTP client):

PLESK_INFO: 530 Login incorrect.
Login failed.

PLESK_INFO: ftp: connect: Connection refused

PLESK_INFO: Response: 227 Entering Passive Mode (203,0,113,111,250,241).
...
Error: Connection timed out after 20 seconds of inactivity
Error: Failed to retrieve directory listing

PLESK_INFO: ftp: connect: Connection timed out

PLESK_INFO: 425 Can't open data connection.

PLESK_INFO: An error occurred opening that folder on the FTP server. Make sure you have permission to access that folder. The operation timed out

PLESK_INFO: Error listing directory '/httpdocs'. Transfer channel can't be opened. Reason: No connection could be made because the target machine actively refused it. Could not retrieve directory listing

PLESK_INFO: Connecting data socket to (203.0.113.2) port 39383
Socket error (Connection timed out) - reconnecting
It is not possible to get a directory listing by FTP using Secured TLS: the connection establishes but directory listing does not work. The following errors appear in /var/log/secure:

CONFIG_TEXT: pam_env(proftpd:setcred): Unable to open config file: /etc/security/pam_env.conf: Permission denied
pam_systemd(proftpd:session): Failed to connect to system bus: Permission denied
pam_listfile(proftpd:auth): Couldn't open /etc/ftpusers

The passive port range (by default, 49152-65535) is not properly configured.

Configure the passive port range: