Pablo Software Solutions

[Andrew Lee]

Hi,

Client is just Active mode...
Client connects dataport number 20...
I want Server dataport number 20...

(if Client is passive mode, port range 20-20... but Client is not Passive mode...just Active mode...)

How do i?

[admin]

In active mode the client determines the port which is used for the data connection (that's why it's called active mode), so you can't change the port on the server side, you have to set it in the client (if possible).

[Andrew Lee]

ex)
< Client > < Server >

PORT 4233 -> Port 21
<- Sync 4233 - dataport 20
Data Send -> Port 20

Client Source port = 4233
Destination port = 20

Server Source port = 20
Destination port = 4233


???

[admin]

Please try to understand the concept of active vs passive mode.
It's not a limitation of the server it's just the way the FTP protocol works.

Also read this very usefull information: http://slacksite.com/other/ftp.html for more information about PASV and PORT mode.

[Andrew Lee]

Mr. Pablo...
Sorry..
You don't understand me...

Q & E Ftp Server isn't using standard dataport 20....
Q & E Ftp Server is using random dataport number...isn't it?

Client is always Active mode, I want to use Q & E Ftp Server dataport number 20...

How do I?
Do I misunderstanding now???

[admin]

I'm sorry, but I think you are wrong.
In active mode (PORT), the FTP client determines the port used for the data connection. You (or the server) cannot change this port, unless you can configure it in the FTP client.

In passive mode (PASV), the FTP server determines the port used for the data connection, this is the port range you specify in the server configuration.