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From "daniel damon (JIRA)" <j...@apache.org>
Subject [jira] Created: (NET-363) Can't connect to a server behind firewall in passive mode
Date Fri, 04 Mar 2011 23:12:47 GMT
Can't connect to a server behind firewall in passive mode
---------------------------------------------------------

                 Key: NET-363
                 URL: https://issues.apache.org/jira/browse/NET-363
             Project: Commons Net
          Issue Type: Bug
          Components: FTP
    Affects Versions: 2.2
         Environment: Windows Client with Zos mainframe server behind a firewall.  However
I think any client/server will demonstrate the issue as long as the server is behind a firewall.
            Reporter: daniel damon
            Priority: Blocker


When the FTP server is behind a firewall, FTPClient can connect, but it cannot transfer data.
This is because the FTP server provides it's own address instead of the firewall address to
make the connection. I have confirmed the problem by hacking a copy of FTPClient to set the
__passiveHost to the appropriate internet address. With this hack, I can transfer data.

Perhaps the FTP server could be configured differently to fix the issue. Unfortunately, I
do not have access to the server configuration. I do know that the commercial product IpswitchFtp
does deal with the issue as this extract from it's log shows:
------------
PASV
227 Entering Passive Mode (192,168,13,11,195,129)
connecting data channel to 192.168.13.11:195,129(50049)
Substituting connection address 159.106.121.79 for private address 192.168.13.11 from PASV
data channel connected to 159.106.121.79:195,129(50049)
LIST
125 List started OK
transferred 4157 bytes in 0.078 seconds, 425.688 kbps ( 53.211 kBps), transfer succeeded.
250 List completed successfully.
QUIT
----------------------------
I can take a shot at a fix if you want. I'll set some timeout, and  if that fails, I'll use
the original address

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