ActiveMQ Remote Broker - php

I'm an ActiveMq - STOMP PHP- Beginner.
How can I connect to a remote Broker on STOMP, the Producer is in php.
If I connect to the broker on the same machine like this:
$stompCon = new Stomp('tcp://localhost:61613');
$stompCon->connect();
$stompCon->send('/queue/notifications.test', $mapMessage);
$stompCon->disconnect();
it connects ok, but when I try on an external server like:
$stompCon = new Stomp('tcp://181.61.50.8:61613',$user,$pass);
$stompCon->connect();
$stompCon->send('/queue/notifications.test', $mapMessage);
$stompCon->disconnect();
It doesn't connect. Does someone knows how I can connect to a remote broker on another machine?
Error messsage:
Internal Server Error
The server encountered an internal error or misconfiguration and was
unable to complete your request.
Please contact the server administrator, webmaster and inform them of
the time the error occurred, and anything you might have done that may
have caused the error.
More information about this error may be available in the server error
log.
Additionally, a 500 Internal Server Error error was encountered while
trying to use an ErrorDocument to handle the request.
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Originate server : AWS ec2 / PHP 5.4 / Guzzle
Remote server : AWS ec2 through elb
CURL info :{
"url":"https:\/\/xxx\/xxx",
"content_type":null,
"http_code":0,
"header_size":0,
"request_size":5292,
"filetime":-1,
"ssl_verify_result":0,
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Run a tcpdump and analyse traces based on that you can decide.
Additionally you can enable log level in both applications in Originate and Remote servers.
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