What are common pitfalls with ftp and sftp commands?

When using FTP and SFTP commands, there are several common pitfalls that users often encounter. Understanding these can help ensure smoother file transfer operations.

Common Pitfalls

  • Using Incorrect Credentials: Inputting the wrong username or password can lead to failed connections.
  • Firewall Settings: Ensure the firewall is configured to allow FTP/SFTP connections.
  • Passive vs Active Mode: FTP has two modes; using the wrong one can fail connections, especially when behind NAT.
  • File Permissions: Ensure that the correct permissions are set on files to transfer properly.
  • Wrong Port Configuration: FTP typically uses port 21, while SFTP uses port 22. Ensure the right port is set.

Example of FTP Command

<?php // Connect to FTP server $ftp_server = "ftp.example.com"; $ftp_user_name = "user"; $ftp_user_pass = "password"; // Set up a connection $conn_id = ftp_connect($ftp_server); // Login if (@ftp_login($conn_id, $ftp_user_name, $ftp_user_pass)) { echo "Connected as $ftp_user_name@$ftp_server\n"; } else { echo "Couldn't connect as $ftp_user_name\n"; } // Close the connection ftp_close($conn_id); ?>

ftp sftp common pitfalls file transfer firewall settings file permissions port configuration

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