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Can not connect to any FTP through web proxy

It´s a problem we have since a long time, that ftp connections through the webproxy don´t work.

The ftp proxy is enabled in transparent mode. In the web proxy the ftp service is enabled but I can not connect.

What I don´t understand that I see always a droped connection from my client to the proxy on port 80 when I try to access an ftp server.

Any idea?

Here is the output from FileZilla

Status: Connecting to ftp.astaro.com through proxy
Status: Resolving address of proxy
Status: Connecting to ***.***.***.***:3128...
Status: Connection with proxy established, performing handshake...
Response: Proxy reply: HTTP/1.1 200 Connection Established
Status: Connection established, waiting for welcome message...
Response: 220 Welcome to Astaro FTP Service.
Command: USER anonymous
Response: 331 Please specify the password.
Command: PASS **************
Response: 230 Login successful.
Command: SYST
Response: 215 UNIX Type: L8
Command: FEAT
Response: 211-Features:
Response:  AUTH SSL
Response:  AUTH TLS
Response:  EPRT
Response:  EPSV
Response:  MDTM
Response:  PASV
Response:  PBSZ
Response:  PROT
Response:  REST STREAM
Response:  SIZE
Response:  TVFS
Response:  UTF8
Response: 211 End
Command: OPTS UTF8 ON
Response: 200 Always in UTF8 mode.
Status: Connected
Status: Retrieving directory listing...
Command: PWD
Response: 257 "/"
Command: TYPE I
Response: 200 Switching to Binary mode.
Command: EPSV
Response: 229 Entering Extended Passive Mode (|||15336|).
Command: LIST
Status: Connecting to ***.***.***.***:3128...
Status: Connection with proxy established, performing handshake...
Response: Proxy reply: HTTP/1.1 200 Connection Established


But the proxy is not able to list the directories.

In a browser it doesn´t work as well.


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