When a connection is established

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An active FTP connection is one way to transfer files using the File Transfer Protocol (FTP). During an active connection, the client computer initiates a connection to the FTP server, which is listening on port 21 (the standard port for FTP).

the client tells the FTP server the port on its computer on which it will listen for a return connection to the server to transfer data. This is usually a high-numbered port, since standard ports (such as port 20) may already be in use by other services.

However, it is important to note that when using a live connection, the gambling data russia client-side firewall must allow incoming connections to the port that the client has specified for the return connection to the server. This can cause some security issues, as opening high ports can make the system vulnerable to attack.

In a passive FTP connection, the client connects to port 21 of the server as usual to establish a connection. However, instead of the server initiating a return connection to the client (which may be blocked by a firewall or NAT device), the client asks the server for the port on which to establish a connection.

When a client establishes a passive connection, it sends a PASV (Passive) command to the server on port 21. The server responds to this request by telling the client the IP address and port number on which the client should connect to transmit data. After receiving this information, the client connects to the specified port on the server.