Internet Transfer Control & Passive Mode

[wizzard]

Hi,

I have a question i've made a little ftp client with the ITC but problem is i'm behind a firewall(NAT) and i want to turn off the Passive Mode. Is this possible?

Regards
Wizzard

[ChiefRB]

I think its as simple as executing a PASV command, possibly before each transfer. Read this:
http://www.faqs.org/rfcs/rfc1579.html

And here's some extracts from the FTP RFC (you should read that as well)

When data is to be transferred between two servers, A and B (refer
      to Figure 2), the user-PI, C, sets up control connections with
      both server-PI's.  One of the servers, say A, is then sent a PASV
      command telling him to "listen" on his data port rather than
      initiate a connection when he receives a transfer service command.
      When the user-PI receives an acknowledgment to the PASV command,
      which includes the identity of the host and port being listened
      on, the user-PI then sends A's port, a, to B in a PORT command; a
      reply is returned.  The user-PI may then send the corresponding
      service commands to A and B.  Server B initiates the connection
      and the transfer proceeds.  The command-reply sequence is listed
      below where the messages are vertically synchronous but
      horizontally asynchronous:

User-PI - Server A                User-PI - Server B
         ------------------                ------------------
         
         C->A : Connect                    C->B : Connect
         C->A : PASV
         A->C : 227 Entering Passive Mode. A1,A2,A3,A4,a1,a2
                                           C->B : PORT A1,A2,A3,A4,a1,a2
                                           B->C : 200 Okay
         C->A : STOR                       C->B : RETR
                    B->A : Connect to HOST-A, PORT-a

[wizzard]

Hi,

I've tried this on the itc control but it doesn't works maybe i'm doing something wrong.
Can you give me an example how i can do this?

Regards
Wizzard

[ChiefRB]

Well, since I've never done it before, I can't really no. Also, I wouldn't know if you'd tried it or not. How about you post what you've tried, what errors you're getting etc.....