Question

FileZilla SSL Gets Error: 425 Can't open data connection.

Asked by: hazenweber

I have a FileZilla 0.9.24 FTP Server sitting behind a Cisco PIX 506 Firewall running 6.3(5) and configure with PAT for Network Address Translation.  When connecting in passive mode to the server without SSL/TSL Explicit turned on, I can connect and everything works great.  If I turn on SSL/TSL Explicit on the server and the client (using FileZilla Client) I get the following:

WITHOUT SSL/TSL (WORKS)
Status:      Connecting to PUBLIC IP ADDRESS:21...
Status:      Connection established, waiting for welcome message...
Response:      220 You are connec
Command:      USER GUEST
Response:      331 Password required for guest
Command:      PASS *****
Response:      230 Logged on
Command:      SYST
Response:      215 UNIX emulated by FileZilla
Command:      FEAT
Response:      211-Features:
Response:       MDTM
Response:       REST STREAM
Response:       SIZE
Response:       MLST type*;size*;modify*;
Response:       MLSD
Response:       AUTH SSL
Response:       AUTH TLS
Response:       UTF8
Response:       CLNT
Response:       MFMT
Response:      211 End
Status:      Connected
Status:      Retrieving directory listing...
Command:      PWD
Response:      257 "/" is current directory.
Command:      TYPE I
Response:      200 Type set to I
Command:      PASV
Response:      227 Entering Passive Mode (EXTERNAL IP ADDRESS,242,92)
Command:      LIST
Response:      150 Connection accepted
Response:      226 Transfer OK
Status:      Directory listing successful
Status:      Disconnected from server

WITH SSL/TSL (DOESN'T WORK)
Status:      Connecting to EXTERNAL IP ADDRESS:21...
Status:      Connection established, waiting for welcome message...
Response:      220 You are connec
Command:      AUTH TLS
Response:      234 Using authentication type TLS
Status:      Initializing TLS...
Command:      USER GUEST
Status:      Verifying certificate...
Status:      TLS/SSL connection established.
Response:      331 Password required for guest
Command:      PASS *****
Response:      230 Logged on
Command:      SYST
Response:      215 UNIX emulated by FileZilla
Command:      FEAT
Response:      211-Features:
Response:       MDTM
Response:       REST STREAM
Response:       SIZE
Response:       MLST type*;size*;modify*;
Response:       MLSD
Response:       AUTH SSL
Response:       AUTH TLS
Response:       UTF8
Response:       CLNT
Response:       MFMT
Response:      211 End
Command:      PBSZ 0
Response:      200 PBSZ=0
Command:      PROT P
Response:      200 Protection level set to P
Status:      Connected
Status:      Retrieving directory listing...
Command:      PWD
Response:      257 "/" is current directory.
Command:      TYPE I
Response:      200 Type set to I
Command:      PASV
Response:      227 Entering Passive Mode (EXTERNAL IP ADDRESS,182)
Command:      LIST
Response:      425 Can't open data connection.
Error:      Failed to retrieve directory listing

The Cisco PIX has translation lists that are port 21 redirect to port 21 and the same for port 20
I have access rules for ports 21 and 20 pointing to the interior server.

Also I'm running behind a Linksys Wireless WRT54G, but am getting the same results running plugged directly into my Cable Modem.

Everything works without SSL/TSL; but once I turn it on I get this error.  Thank you for your help

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Asked On
2007-11-02 at 13:35:33ID22935858
Tags

filezilla

,

data

,

open

,

425

,

connection

Topics

Secure Socket Layer (SSL) & HTTPS

,

Cisco PIX Firewall

,

FTP Servers

Participating Experts
3
Points
300
Comments
3

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Answers

 

by: jeffldPosted on 2007-11-02 at 14:02:05ID: 20204495


Unfortunately FTPS (SSL) requires high ports.  The ports are above 1023 and you are going to have to open the outbound high ports in the firewall if you want it to work.  

The control channel of FTPS uses port 21, but the data channel uses high ports, this is why you can login and connect, but cannot see a directory listing.

Check with the FTPS server admin to find out what ports are configured.  Hopefully the FTPS server admin has at least set a small range so that you don't have to open up so much on your firewall.  

FTPS is not firewall friendly.

 

by: FKoutchoukPosted on 2009-02-22 at 11:36:52ID: 23706102

How do I control / set the value of the range of "high ports" on the FileZilla server?

 

by: ParanormasticPosted on 2009-04-03 at 14:09:39ID: 24064352

This normally gets set to TCP 990 for FTPS (FTP over SSL).  Port 22 may be used for SFTP (SSH secured FTP)

20120131-EE-VQP-002

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