![]() ![]() The data connection is usually where most of the confusion and problems arise for FTP server administrators. When an FTP client uses the control connection to instruct Cerberus FTP Server to send a file listing or transfer a file, the actual data exchange takes place on the data connection. This is the connection that an FTP server uses to exchange file listings and transfer files on. The second type of connection is called the data connection. If the port that Cerberus is listening on is blocked, no one will be able to see or connect to the FTP server. However, if the administrator is running a software-based firewall, the administrator must be certain that connections are not blocked on the port chosen for the control connection. Using the default port is not mandatory – the administrator is free to change the listener to use any free port on the system as the listening port. Port 21 is considered the default control connection port, and this is the default port that Cerberus FTP Server will configure your IP interfaces to listen on for new connections. The control connection’s purpose is to allow clients to connect and to send commands to the server (and receive server responses). The control connection is always the first connection established with an FTP server. Ensuring these connections can be established are the two areas where special attention is usually needed. Communication with an FTP server is done through two connections, a control connection, and a data connection. SSH SFTP and HTTP/S are very different protocols and work differently.ĭepending upon your connection to the Internet, you may need to configure your router or firewall before users outside of your local network can see your FTP server. NOTE: The following applies to the FTP protocol only.
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