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| Use active and passive FTP in IE for file transfers |
| The FTP protocol supports two modes: active and passive. With active mode, the client establishes a |
| connection to the server on port 21. Then the client sends a PORT command to the FTP server to |
| specify the port on which the client will receive the data. The server establishes a new connection |
| to the client and sends the data from port 20. Many firewalls don't accept new incoming connections |
| from an external interface, so even though the firewall allows ports 20 and 21, it drops the |
| incoming connection from the server and the FTP session fails. |
| For that reason, you might need to use passive mode for FTP. In this mode, the client issues a |
| PASV command to the server, which opens a port at 1024 or higher (the range depends on the |
| server). The server uses the new port as the source for the data, which eliminates the need to |
| establish a new connection to the client, and therefore, gets around the problem of the firewall |
| IE supports both active and passive FTP modes. When you use folder view for FTP in IE, it uses |
| active FTP. You can configure it for passive mode if necessary to make FTP work through your |
| Open IE, go to Tools | Internet Options and click the Advanced tab. |
| Place a check beside the option Use Passive FTP. |
| Remove the check beside the option Enable Folder View For FTP Sites. |
| An important point to understand is that when you enable folder view, IE operates in active mode |
| regardless of the state of the Use Passive FTP option. You must turn off folder view to use passive |
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