FTP with SSL: ftp_fput(): Connection timed out on successful writes

[ionutantohi]

Description

The following code:

<?php

set_error_handler(function ($severity, $message) {
    echo $message;
});

$host = '';
$user = '';
$pass = ''';

$connection = ftp_ssl_connect($host);
ftp_login($connection, $user, $pass);
ftp_pasv($connection, true);
ftp_fput($connection, 'test-upload.txt', fopen(__DIR__ . '/my-file.txt', 'r'), FTP_BINARY);

Resulted in this output:

ftp_fput(): Connection timed out exception

But even the if exception was raised, the file is written successfully on the server.

But I expected this output instead:

no exception

PHP Version

PHP 8.4.13 (cli) (built: Oct  1 2025 20:33:51) (NTS)
Copyright (c) The PHP Group
Built by Debian
Zend Engine v4.4.13, Copyright (c) Zend Technologies
    with Zend OPcache v8.4.13, Copyright (c), by Zend Technologies

and also on

PHP 8.2.29 (cli) (built: Jul  3 2025 13:07:49) (NTS)
Copyright (c) The PHP Group
Zend Engine v4.2.29, Copyright (c) Zend Technologies
    with Zend OPcache v8.2.29, Copyright (c), by Zend Technologies

Operating System

Ubuntu 22.04.3 LTS (GNU/Linux 5.15.0-157-generic x86_64)

[nielsdos]

Please provivde the following extra information:

• Does this reproduce consistently?
• Is this a new issue after upgrading PHP versions (i.e. is this a regression)?
• What FTP server software do you use?
• How large is the file you try to upload?
• How long is the timeout?

[ionutantohi]

Does this reproduce consistently? Yes
Is this a new issue after upgrading PHP versions (i.e. is this a regression)? No. same thing happens on 8.2 and 8.4
What FTP server software do you use? I will try to find out. ftp_systype returns Windows_NT
How large is the file you try to upload? small. few kb
How long is the timeout? I am using timeout defaults. The file is written and exception is thrown in 1-3 seconds