The numbers represent the code for the response and the optional text represents a human-readable explanation or request (e.g. For example, "200" (or "200 OK") means that the last command was successful. The server responds over the control connection with three-digit status codes in ASCII with an optional text message. Further changes were introduced to the passive mode at that time, updating it to extended passive mode. īoth modes were updated in September 1998 to support IPv6. In this mode, the client uses the control connection to send a PASV command to the server and then receives a server IP address and server port number from the server, which the client then uses to open a data connection from an arbitrary client port to the server IP address and server port number received. In situations where the client is behind a firewall and unable to accept incoming TCP connections, passive mode may be used.The server then initiates a data channel to the client from its port 20, the FTP server data port. ![]() It sends the FTP command PORT M to inform the server on which port it is listening.
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