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9 Φεβ 2024 · When you establish an FTP session by sending FTP commands between an FTP client and a FTP server, you do so over port 21. When you transmit files between the client and server, you do so over port 20, but only if you are engaging in an active mode FTP session.
FTP ports 20 and 21 must both be open on the network for successful file transfers. FTP Port 21 is the Default Control Port. After the correct FTP username and password are entered through FTP client software, the FTP server software opens port 21 by default. This is sometimes called the command or control port by default.
24 Ιαν 2023 · FTP is useful for transferring files between computers, either remotely or within a local network — your personal computer can even act as an FTP server. FTP can also be used to upload files from a computer to a web hosting account. FTP (Source: Progress)
16 Αυγ 2022 · FTP communications use two TCP port number values: one for commands -- port 21 by default -- and one for data transfer. This is where the PORT command comes into play. The PORT command is sent by an FTP client to establish a secondary connection (address and port) for data to travel over.
28 Απρ 2024 · The command channel is used to transfer the commands and responses from client to server and server to client. FTP uses the same approach as TELNET or SMTP to communicate across the control connection. It uses the NVT ASCII character set for communication. It uses port number 21.
5 Μαρ 2024 · FTP uses port 21 for control connections and port 20 for data connections. FTPS uses port 990 for control connections and port 989 for data connections under implicit security. When using explicit security, FTPS can also use port 21. Learn more about securing an FTP or SFTP server on our blog.
7 Ιουν 2024 · For example, FTP uses port 21 for control connections and port 20 for data connections. In summary, understanding FTP TCP port numbers is essential for efficient file transfer over a network. FTP utilizes the TCP protocol to establish connections between devices and transfer data reliably.
