![]() This system is more secure than an active connection because the initiating party is the client and the server connects to the relevant port. The server sends the client information from whichever port the server can receive it. The client requests a file from the server. In a passive connection, the server decides which way to transfer data. As a consequence, an attacker can scan the client for open ports and hack into the machine using one of the FTP ports discovered to be open. If the firewall opens a port to enable this and accepts connections from these ports, it is extremely risky. One of the most significant flaws in this system begins with the server starting the transfer and the client's firewall approving this connection. They then request that the server start the data transmission from a certain port, and the server does so. The client selects how the data will be sent during an active connection. There are also two different types of connection when transferring files: active and passive. So this is the main purpose of FTP's existence. In the data channel, the file transfer process takes place. ![]() Clients connect to this port of the server and initiate data communication. ![]() If you've done CTF solutions using software like nmap before, you've probably seen port 21. ![]()
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