title: "curl" connection to ftp impossible : "500 ?"
body: <p>I am trying to connect to my NAS FTP server from a raspberry pi using the command "curl". The connection use ssl encryption, so I am using the following command type:</p>
  
  <pre><code>curl --ftp-ssl &lt;FTPSERVEUR&gt;:21 --user "&lt;USER&gt;:&lt;PASS&gt;"
  </code></pre>
  
  <p>Unfortunately, I get :</p>
  
  <pre><code>220---------- Welcome to Pure-FTPd [privsep] [TLS] ----------
  220-You are user number 1 of 10 allowed.
  220-Local time is now 20:38. Server port: 21.
  220-IPv6 connections are also welcome on this server.
  220 You will be disconnected after 10 minutes of inactivity.
  530 You aren't logged in
  500 ?
  500 ?
  500 ?
  500 ?
  500 ?
  </code></pre>
  
  <p>And then nothing appends.
  It seems that curl is even not able to transmit my ID to the server.. Do you have any idea of what is going on ?</p>
  
  <p>Thank you in advance for your help.</p>