Issue Can't connect to FTP with any account but root

[Ceriana]

Server operating system version

Ubuntu 18.04

Plesk version and microupdate number

18.0.62 Update #2

Hello everyone,

I just added multiple FTP accounts in via the FTP accounts formular on the domain page.
Turns out: I can't connect with any of them, just with the root account. The error message always looks the same:

Status: Connecting to DOMAIN...
Response: fzSftp started, protocol_version=11
Command: open "USER@DOMAIN" 22
Status: Using username "USER".
Command: Pass: ***********
Status: Connected to DOMAIN
Error: Could not connect to server

So I got connected, but then lost connection immediately after?

I thought of the firewall, but everything there is set to allow FTP on port 22; and I can connect with the root account though.
Also, I thought that I might find something about the connection attempts in the auth.log, but I can't find anything. Is there something logged about the attempts? If so, where?

Thanks.

 

[AYamshanov]

allow FTP on port 22

I think this is because of the difference between "FTP", "FTPS", and "SFTP".

• sFTP
• FTP Access to Your Websites
• (Plesk for Linux) Configuring Passive FTP Mode
• https://support.plesk.com/hc/en-us/...ecure-FTP-FTPS-connections-in-Plesk-for-Linux

 

[Ceriana]

I think this is because of the difference between "FTP", "FTPS", and "SFTP".

• sFTP
• FTP Access to Your Websites
• (Plesk for Linux) Configuring Passive FTP Mode
• https://support.plesk.com/hc/en-us/...ecure-FTP-FTPS-connections-in-Plesk-for-Linux

RN, everything is set as in the articles you linked, including the passive ports. It just works for the root user only, but not for other users.

 

[AYamshanov]

Command: open "USER@DOMAIN" 22

If you use FTP, then I do not understand why in the provided logs "22" port is used, it is related to SSH/SFTP, not FTP.
FTP uses the 21 port to initiate the first connection to a server.