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Issue FTP randomly stops working, only SFTP is accessible.

Rowan

New Pleskian
This wasn't the first time but ProFTPD randomly stops working while it's still listening on port 21 it doesn't accept requests other than SFTP.

Status: Connection established, waiting for welcome message...
Error: Connection closed by server

I've already tried re configuring passive FTP with the following documentation:

Within that documentation I also followed the firewall rules and NAT policy but all have no success.

Does anyone have any suggestions that I could follow? the symptoms started a few months ago after a Plesk update.
 
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