How to Troubleshoot Failed FTP Uploads Using PHP ftp_put?

Troubleshooting FTP Upload Failures with PHP ftp_put

Issue:

While attempting to upload an XML file to an FTP server using ftp_put, the operation consistently fails and returns false.

Resolution:

Switch to Passive FTP Mode:

The most common reason for ftp_put failures is the default behavior of PHP, which uses the active FTP mode. In many cases, the solution is to switch to passive mode using the ftp_pasv function. Here's the code snippet:

<code class="php">$connect = ftp_connect($ftp) or die("Unable to connect to host");
ftp_login($connect, $username, $pwd) or die("Authorization failed");
ftp_pasv($connect, true) or die("Unable switch to passive mode");</code>

Configure PASV Addressing:

If your FTP server reports an incorrect IP address in response to the PASV command due to firewall or NAT usage, you can workaround the issue by disabling FTP_USEPASVADDRESS:

<code class="php">ftp_set_option($connect, FTP_USEPASVADDRESS, false);</code>

Additional Resources:

• [PHP ftp_put fails with "Warning: ftp_put(): PORT command successful"](https://stackoverflow.com/questions/13218988/php-ftp-put-fails-with-warning-ftp-put-port-command-successful)
• [Active and Passive FTP Connection Modes](https://stackoverflow.com/questions/10037230/how-can-i-check-if-passive-ftp-mode-is-enabled-in-php)
• [PHP FTP Passive FTP Server Behind NAT](https://stackoverflow.com/questions/3054294/php-ftp-passive-ftp-server-behind-nat)

Note:

It's important to note that ftp_pasv must be called after ftp_login to have any effect.

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