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FTP, sin embargo, funciona en dos puertos diferentes del Protocolo de Control de Transmisión (TCP): 20 y 21. Los puertos FTP 20 y 21 deben estar abiertos en la red para que las transferencias de archivos se realicen correctamente.
9 Φεβ 2024 · While port 21 is for sending commands to an FTP server, port 20 transfers files during active mode FTP sessions. As data sent over these ports are unencrypted, consider using one of the more secure versions of the protocol.
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.
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.
16 Αυγ 2022 · FTP uses control and data channels, each using a separate TCP port. Port 21 is for the control channel, and port 20 is for the data channel. Learn how these two channels are used.
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.
30 Οκτ 2024 · Port 21 is used to establish the connection between the 2 computers (or hosts) and port 20 to transfer data (via the Data channel). But there are some instances where port 21 is used for both, establishing a connection and data transfer and I will analyse them shortly.
