Filezilla server started to give 425 error on EPSV connections

Hi,

We've had Filezilla FTP server running on our server for years now without any problems.

We recently moved from a self hosted environment to a virtual one and P2V'd our FTP server.

Ever since then one customer can't FTP files to us.

They have a program that collates xml files, zips them and sends them to us.

I've noticed in the log file that they are issuing an EPSV command (twice) then an EPRT (which I thought we should be ignoring?)

They then get as far as trying to open the data channel and it fails with a 425 error.

I've asked the company hosting the servers to investigate their firewall and they can't see anything that could be causing this.

They have also opened all ports from the customers IP to this server and the transfer still fails.

Can anyone offer any thoughts? All other FTP connections work fine.

(003548) 19/06/2013 09:53:54 - (not logged in) (195.69.xxx.xx)> Connected, sending welcome message...
(003548) 19/06/2013 09:53:54 - (not logged in) (195.69.xxx.xx)> 220-FileZilla Server version 0.9.23 beta
(003548) 19/06/2013 09:53:54 - (not logged in) (195.69.xxx.xx)> 220 Welcome to our FTP Server
(003548) 19/06/2013 09:53:54 - (not logged in) (195.69.xxx.xx)> USER xxxx
(003548) 19/06/2013 09:53:54 - (not logged in) (195.69.xxx.xx)> 331 Password required for xxxx
(003548) 19/06/2013 09:53:54 - (not logged in) (195.69.xxx.xx)> PASS xxxx
(003548) 19/06/2013 09:53:54 - ftpusername (195.69.xxx.xx)> 230 Logged on
(003548) 19/06/2013 09:53:54 - ftpusername (195.69.xxx.xx)> CWD ToCompanyName
(003548) 19/06/2013 09:53:54 - ftpusername (195.69.xxx.xx)> 250 CWD successful. "/ToCompanyName" is current directory.
(003548) 19/06/2013 09:53:54 - ftpusername (195.69.xxx.xx)> TYPE I
(003548) 19/06/2013 09:53:54 - ftpusername (195.69.xxx.xx)> 200 Type set to I
(003548) 19/06/2013 09:53:54 - ftpusername (195.69.xxx.xx)> EPSV ALL
(003548) 19/06/2013 09:53:54 - ftpusername (195.69.xxx.xx)> 229 Entering Extended Passive Mode (|||1816|)
(003548) 19/06/2013 09:53:54 - ftpusername (195.69.xxx.xx)> EPSV
(003548) 19/06/2013 09:53:54 - ftpusername (195.69.xxx.xx)> 229 Entering Extended Passive Mode (|||1817|)
(003548) 19/06/2013 09:54:16 - ftpusername (195.69.xxx.xx)> EPRT |1|195.69.xxx.xx|2765|
(003548) 19/06/2013 09:54:16 - ftpusername (195.69.xxx.xx)> 200 Port command successful
(003548) 19/06/2013 09:54:16 - ftpusername (195.69.xxx.xx)> STOR LAAD3_alice.willoughby_20130619_095354.zip
(003548) 19/06/2013 09:54:16 - ftpusername (195.69.xxx.xx)> 150 Opening data channel for file transfer.
(003548) 19/06/2013 09:54:26 - ftpusername (195.69.xxx.xx)> 425 Can't open data connection.
(003548) 19/06/2013 10:04:26 - ftpusername (195.69.xxx.xx)> 421 Connection timed out.
(003548) 19/06/2013 10:04:26 - ftpusername (195.69.xxx.xx)> disconnected.
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LetterpartAsked:
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AlexPaceConnect With a Mentor Commented:
This should be easy enough to debug... Just make yourself a test login account and try to connect using EPSV (extended passive mode) for the data channel..  If you get the same behavior then the issue is with the virtual host.  If it works for you then the problem is mostly likely the other client's firewall.  

Another thing you could do is look in the logs and see if anyone else is using EPSV or if your other clients are all using PASV (tradition passive mode) and PORT (active mode) for their data channels.
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dec0mpileConnect With a Mentor Commented:
Are you using active or passive mode?

Filezilla uses passive mode by default, but for some environments active mode is required (Was there some changes made in your environment?).  

Switch to active mode to test this possibility if you are in passive:

In FileZilla, click on Edit | Settings.

Under Connection, click on FTP and choose Active as the Transfer Mode.

Under Connection, under FTP, click on Active mode and choose “Ask your operating system for the external IP address” (the default setting).

Under Connection, under FTP, click on Passive mode and choose “Fall back to active mode” (this is an optional setting).
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LetterpartAuthor Commented:
We've got no further with this but going to close the question and split the points between you as I appreciate your help and input.

Thanks.
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LetterpartAuthor Commented:
As per my other reply. We have not made any progress with this and are still waiting for the customers IT department to contact us.

So going to close the question down and award points between you as I appreciate your help and input.

Thanks.
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