mint-me wrote:I assume you are using gufw/ufw.
Set the top drop-down, Incoming -> Allow
this will allow all incoming connections.
Allow ftp connection first, add rule from "Advanced" tab:
Allow > In > Both
From: IP [Client]
To: IP [Server] Port 
Then block all other incoming, add rules from "Simple" tab:
Deny > In > TCP 1:65535
Deny > In > UDP 1:65535
That should do it.
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