Why does socket server no longer accept remote connections?

[NotionCommotion]

Finally bit the bullet and migrated to PHP7 as well as Centos7.

 

Unfortunately, remote clients can no longer connect to my sockets server.

 

A client running on the same machine, however, can connect using both 1.2.3.4:1337 as well as 1.2.3.4:1337 (where 1.2.3.4 is the server's IP).

 

I've disabled the firewall just in case, but still cannot connect.  Originally, I was using SSL, but I stripped that all off, and am just using TCP.

 

I don't know if it is related, but the server doesn't respond to pings unless made from its machine, however, Apache will respond to curl 1.2.3.4.

 

What should I investigate?  Thanks!

[NotionCommotion]

EDIT.  I just found out I can connect on port 80.  Why just port 80?

 

If it helps, this is my test script.  The client can only connect when run on the same machine.

<?php
$host='0.0.0.0:1337';
error_reporting(E_ALL);
ini_set('display_startup_errors', 1);
ini_set('display_errors', 1);
openlog('API', LOG_NDELAY, LOG_LOCAL2);


require '../../vendor/autoload.php';


$loop = \React\EventLoop\Factory::create();
$server = new \React\Socket\TcpServer($host, $loop);
$server->on('connection', function (\React\Socket\ConnectionInterface $conn) {
    syslog(LOG_INFO,"onConnect");
    $conn->on('data', function($data) {
        syslog(LOG_INFO,"onData");
        var_dump($data);
    });
    $conn->on('error', function($error, $conn) {
        syslog(LOG_INFO,"onError");
        var_dump($error);
    });
    $conn->on('close', function() {
        syslog(LOG_INFO,"onClose");
    });
});
$server->on('error', function($error) use ($loop){
    $this->logError('onServerError: '.$error->getMessage(), $data);
    //$loop->stop();
});
$loop->run();

<?php
$host='1.2.3.4:1337';
error_reporting(E_ALL);
ini_set('display_startup_errors', 1);
ini_set('display_errors', 1);
openlog('API', LOG_NDELAY, LOG_LOCAL2);


require '../../vendor/autoload.php';


$loop = \React\EventLoop\Factory::create();
$connector = new \React\Socket\TimeoutConnector(new \React\Socket\Connector($loop), 5, $loop);
$connector->connect($host)
->then(function (\React\Socket\ConnectionInterface $conn)  use ($loop) {
    syslog(LOG_INFO,"onConnect");
    $conn->on('data', function($data) {
        syslog(LOG_INFO,"onData");
        var_dump($data);
    });
    $conn->on('error', function($error, $conn) {
        syslog(LOG_INFO,"onError");
        var_dump($error);
    });
    $conn->on('close', function() {
        syslog(LOG_INFO,"onClose");
    });
})->otherwise(function(\RuntimeException $error) use(&$response, $loop){
    syslog(LOG_INFO,"onTimeout");
});
$loop->run();

[kicken]

Your symptoms all point to a firewall blocking traffic. Sounds like you didn't disable it properly or perhaps you have a second one somewhere.

[NotionCommotion]

Maybe selinux?

[NotionCommotion]

Bummer

 

It is a 1&1 vps.  Maybe they have a hardware firewall?  I will call them.

SELinux status:                 disabled

[NotionCommotion]

You were right!  Another firewall.