Editing TLS specifications (section)

=== Points of interest ===

* Section 7.2.1. of RFC 2246: Closure alerts<br />
<blockquote><pre>The client and the server must share knowledge that the connection is
ending in order to avoid a truncation attack. Either party may
initiate the exchange of closing messages.
[...]
Each party is required to send a close_notify alert before closing
the write side of the connection.
</pre></blockquote>

:Lots of FTP servers did not follow the specifications and were vulnerable to truncation attacks. FileZilla will properly fail transfers on those servers.