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From "Allen Firstenberg (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FTPSERVER-420) When picking a passive port, use "random port" from the pool instead of "lowest port"
Date Thu, 16 Jun 2011 18:44:47 GMT
When picking a passive port, use "random port" from the pool instead of "lowest port"
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                 Key: FTPSERVER-420
                 URL: https://issues.apache.org/jira/browse/FTPSERVER-420
             Project: FtpServer
          Issue Type: Improvement
          Components: Core
            Reporter: Allen Firstenberg


As discussed on the mailing list <http://www.mail-archive.com/ftpserver-users@mina.apache.org/msg01635.html>,
passive ports are allocated from the pool based on the lowest available port from the list.
 This may cause problems with some firewalls or clients that may not release the port as quickly
as the server expects.  It is also a minor security risk to provide an easily guessable port
for passive connections.

Discussion on the list centered around other options to allocate ports, focusing on a random
port assignment from the available pool.


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