ufw ubuntu 不规则地阻塞 ftp_connect() PHP

Question

我正在编写一个简单的 php 应用程序，它连接 ftp 服务器并从中获取数据。问题是我有时会成功连接，有时会被阻止。这是我在 Ubuntu 和 Apache

中运行的代码

$ftpConn = ftpConnect($ftpHost, $ftpUser, $ftpPassword);


function ftpConnect($host, $user, $password) {
    $ftpConn = ftp_connect($host,21,3)or die("Couldn't connect to $host");
    $login = ftp_login($ftpConn, $user, $password);
    // check connection
    if ((!$ftpConn) || (!$login)) {
        echo 'FTP connection has failed again! Attempted to connect to ' . $host . ' for user ' . $user . '.';
    } else {
        return $ftpConn;
    }
}

ufw 状态编号如下：

[ 1] Apache Full                ALLOW IN    Anywhere
[ 2] 20/tcp                     ALLOW IN    Anywhere
[ 3] 21/tcp                     ALLOW IN    Anywhere
[ 4] 40000:50000/tcp            ALLOW IN    Anywhere
[ 5] 990/tcp                    ALLOW IN    Anywhere
[ 6] 9822                       ALLOW IN    Anywhere
[ 7] Apache Full (v6)           ALLOW IN    Anywhere (v6)
[ 8] 20/tcp (v6)                ALLOW IN    Anywhere (v6)
[ 9] 21/tcp (v6)                ALLOW IN    Anywhere (v6)
[10] 40000:50000/tcp (v6)       ALLOW IN    Anywhere (v6)
[11] 990/tcp (v6)               ALLOW IN    Anywhere (v6)
[12] 9822 (v6)                  ALLOW IN    Anywhere (v6)

我不确定为什么会这样。欢迎任何建议

Answer 1

我尝试连接的 ftp 服务器被配置为在被动连接时使用 30000:61000/tcp 端口，因此我的本地防火墙允许其中一些端口并拒绝其他端口。解决？增加允许的端口范围。

谢谢！

ufw ubuntu 不规则地阻塞 ftp_connect() PHP

ufw ubuntu blocks iregularly ftp_connect() PHP

php

apache

ubuntu

ftp

ufw