Re: Passive and Active ftp mode

On Fri, Aug 09, 2002 at 11:35:23AM -0400, Ruiyuan Jiang wrote:
> Hi, all

Hi!

> In my ftp-proxy.conf file, I have enabled "DestinationTransferMode client"
> which I believe that transfer mode is decided by whoever starts ftp session
> not by ftp proxy server.

Yes, "DestinationTransferMode client" is the right flag to allow
users to select the transfer mode (active or passive ftp) to server.

> Generally we run ftp passive mode and the command is issued by ftp users
> from their PCs, etc which runs great. But we have a particular ftp site
> which requires ftp active mode connection. When users login to the ftp
> server, they can't do anything such as ls, dir command after a while they
> get a message "can't open data connection".

If you are using "DestinationTransferMode client" the proxy have
to be able to do active transfers - it should run on a machine
with an official IP.

Take a look into the syslog messages, there may be different
reasons (you can see them in syslog messages) for the
   "425 Can't open data connection"
answer from proxy, i.e.:

    bad PASV 277 response from server ...
    can't connect Srv-Data ...
    can't connect Cli-Data ...
    Cli-Data: can't bind to ...
    Srv-Data: can't bind to ...

> The message to me is that ftp
> data connection port problem. What configuration that I have to change to
> make it happen? My guess is that parameter "ActiveMinDataPort 40000" and
> "ActiveMaxDataPort 40999" cause the problem but they are commented out in
> the configuration file.

You may use "SockBindRand yes" as well if you are using port ranges.

> I have enabled TCP Wrapper and chroot functions on
> the proxy server. Does anyone know the problem? Thanks. By the way, we run
> proxy server v1.9 on Solaris 9, Sun Blade 100 and attached configuration
> file.  Marius, I have compiled the patch you sent me for the Solaris error
> but I have not installed and tested because my users are using it.

OK.

Kind regards,
 Marius Tomaschewski <[email protected]>
--
 SuSE Linux AG, NÃŒrnberg - SuSE Labs, Product Developement
 PGP public key available:   http://www.suse.de/~mt/mt.pgp
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