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Depending on the operating mode, the data port is not always on port 20. Internet Explorer can be enabled for a passive mode FTP client when you clear this option.FTP uses two ports, a command (control) port and data port traditionally these are assigned ports 21 and 20 respectively. Internet Explorer is an Active mode FTP client when you select the Enable Folder View for FTP sites option (no matter what the Use Passive FTP Option says). To change the Internet Explorer FTP client mode:Ģ.Ĝlick Internet Options on the Tools menu.Ĥ.Ĝlick Enable Folder View for FTP sites. How to Change the Internet Explorer FTP Client Mode Microsoft Internet Explorer 5 and later support both Standard mode and Passive mode. You may need to change the mode that is used by the FTP client, depending on the firewall configuration on either the FTP client or the server. When this occurs, the FTP server does not need to establish a new inbound connection to the FTP client. The FTP server responds to the request by using the ephemeral port as the source port for data transfer. When the client sends a PASV command over the command channel, the FTP server opens an ephemeral port (between 10) and informs the FTP client to request data transfer from that port. Passive mode FTP clients also start by establishing a connection to TCP port 21 on the FTP server to create the control channel. The FTP server must open a new connection to the client when it sends data. In PORT Mode, the FTP server always sends data from TCP port 20. The PORT command contains information about on which port the FTP client receives the data. The client sends a PORT command over the FTP command channel when the FTP client needs to receive data, such as a folder list or file. This connection establishes the FTP command channel. Standard mode FTP clients first establish a connection to TCP port 21 on the FTP server. These commands are sent over the FTP command channel. The Passive mode client sends PASV commands to the FTP Server.

The Standard mode FTP client sends PORT commands to the FTP server. These modes are called Standard (or Active) and Passive (or "PASV").