Unanswered Question
Feb 26th, 2007

I have a client that needs to connect to a FTP Server behind a Firewall. They need to use PASV FTP to access the Server.Can some one tell me what ports to open on the fw. For Active we have to open 20 and 21.. but not sure about PASV



I have this problem too.
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ahmednaas Mon, 02/26/2007 - 10:16

Here is how PASV Mode FTP works:

-The client issues the retrieval request.

-The client issues the PASV command to the server, indicating that it wants the server to go to the passive mode.

-The server sets up a listening port.

-The server responds, letting the client know which port it is listening to for the data connection.

-The client establishes the connection to the address indicated in the server's response to the PASV command.

Also, take a look at these documents:


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