ftp across Firewall

Question

hi ,
i am trying to do an ftp ,where the ftp server is behind a firewall, and ports are not open ,
is there any method by which i can access the ftp server without opening any ports.
I used passive mode to transfer but i got connection timeout exception.

can anyone help me out on this.

regards,

Rabindra

Answer 1

At least one data port must be open, as well as port 21, the control port. Firewalls can often automatically open the required ports as they are chosen.

Answer 2

thanks , but can you please tell which other ports other than port 21 needs to be opened , for both secure and non secure transfer

Answer 3

It is configurable - either in the client (for active mode) or the server (passive mode). Or if not configured the ports are chosen at random.