• Subject: RE: JTOPEN FTP Through a Firewall question
  • From: "Bennion, Dick" <Dick_Bennion@xxxxxxxx>
  • Date: Tue, 9 Jan 2001 15:58:06 -0600

I was mistaken when I said that get and put were working.  I have run
a number of tests and have been focused on the ls problem for some time.

When there is a firewall Get, put and ls all work when using the command
 line ftp tool.  None of them work when I use the FTP object.

I really don't understand what is happening with passive mode.  I understand
the words, but not in the ftp context.  Are the ports standard when using
the
passive mode?

In C an Rbind is used to establish the inbound connection, is there anything
I 
can do to mimic that function?  I got that info from an article in the
Information 
Center - "Using AS/400 client SOCKS support to communicate outside a 
firewall. 

Thanks again,
Dick Bennion

> -----Original Message-----
> From: Dave Wall [SMTP:dawall@us.ibm.com]
> Sent: Tuesday, January 09, 2001 1:09 PM
> To:   JAVA400-L@midrange.com
> Subject:      Re: JTOPEN FTP Through a Firewall question
> 
> 
> The FTP classes uses passive mode when listing files on the server.
> Passive mode means a port other than the default FTP port is used to
> exchange data.  Is it possible the second port is not open through the
> firewall?  I had some confidence that this was it until I realized put
> also
> uses passive mode.  Why would put work when list doesn't?  Could be the
> ftp
> server is set up to handle get/put via passive mode, but not list?
> 
> David Wall
> AS/400 Toolbox for Java
> 
> 
> "Bennion, Dick" <Dick_Bennion@AFCC.com>@midrange.com on 01/09/2001
> 11:52:33
> AM
> 
> Please respond to JAVA400-L@midrange.com
> 
> Sent by:  owner-java400-l@midrange.com
> 
> 
> To:   "'JAVA400-L@midrange.com'" <JAVA400-L@midrange.com>
> cc:
> Subject:  JTOPEN FTP Through a Firewall question
> 
> 
> 
> I am using the jtopen version of the toolkit and I am attempting to
> communicate with a number of sites that are outside our firewall.  I am
> able
> to get and put files, but I am having a problem getting a listing of the
> files in the current working directory.  I am using the FTP class.
> 
> If I am accessing the server directory without going through the firewall
> everything goes perfectly.
> 
> When I attempt ls through the firewall the list of files returned is
> always
> empty.  The message returned is "226 Listing completed."
> 
> I found some documentation that talks about using Rbind() from the client
> to
> establish an inbound connection.
> 
> What should I do to be able to get a list of the files in a directory on
> the
> server?  All help would be much appreciated.
> 
> 
> 
> 
> > Dick Bennion
> 
> 
> 
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