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

Ceriana

New Pleskian
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.
 
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.
 
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