Re: Odd ftpd Problem
From: Fikret Skrgic (skrgic_at_comcast.net)
Date: 09/05/04
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Date: Sun, 05 Sep 2004 20:38:31 GMT
Stefan Willmert wrote:
> I'm stumped, and i'm hoping someone here might be able to point me in the
> right direction.
>
> My ftpd server fails when requesting passive mode from an internet client,
> and therefore, file uploads are not working. I have an automated file
> upload service, and the uploads are leaving zero length files.
>
> Here's the situation.
>
> I have a separate multi-homed server for the network firewall. I use NAT
> to provide access to an ftp server running linux and wu-ftpd. This has
> always worked well in the past.
>
> Recently, my server running the ftpd daemon had a hard drive failure. I
> purchased a new hard drive, partitioned it, and did a complete system
> restore from my backups. Everything works, except for the ftp passive
> mode.
>
> Symptoms:
> 1. Valid users can connect via ftp.
> 2. pwd command works.
> 3. ls command fails when client is an internet client.
> 4. Valid user attempts to upload file (from internet connection)...a zero
> length file is created.
> 5. ls works perfectly when client is local network client.
> 6. upload works when client is local network client.
> 7. Firewall is on a separate machine and has not been changed.
> 8. Firewall machine logs all blocked packets. No packets are logged for
> passive mode requests.
> 9. FTP server logs all errors. No errors reported for ftp service.
> 10. FTP logs report PASV command log when an ls command is issued....the
> command DOES NOT return a directory listing.
> 11. Everything worked prior to the hard drive failure, and the system
> restore.
>
> I've checked for pid files, directory permissions, have replaced the
> wu-ftpd rpm package. I am stumped on how to debug this problem. Any
> suggestions for debugging this issue, to determine why passive mode is
> failing from an internet connection, yet it works from a local network
> connection? I know, it sounds like a firewall issue, however, the firewall
> is on a different machine and has not been changed, it also worked prior
> to the system restore of the ftp server, plus, it logs all blocked
> packets, and no packets are logged during the ftp connection. Plus, i
> opened the firewall temporarily to make sure, and ftp passive mode still
> failed.
>
> Please help with any suggestions on debugging this? I'm looking at
> tcpdump, but i need to learn the exact communication for an ftp client.
>
> Thanks for any help you may provide.
>
> -stefan
I think you need to put this in the conf file
AllowForeignAddress on
By the way, what server is it?
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