Getting could not connect to host error when using soap - php

Question

I am using SOAP to call a web servicefrom a Linux Centos 6 server and a php client. In this week I have been getting could not connect to host error from soapCall method. My code is as below and I have not changed it at all for some months but recently it gets this error most of the time. I have read most answers to related questions here but my problem have not been solved.
$wsdl="http://x.x.x.x:x/gw/services/Service?wsdl";
//Set key as HTTP Header
$aHTTP['http']['header'] = "key:" .$key ."\r\n";
$context = stream_context_create($aHTTP);
try
{
$client = new SoapClient($wsdl,array("soap_version" => SOAP_1_2,'trace' => 1,"stream_context" => $context));
}
catch(Exception $e)
{
return "something";
}
//I make $parametrs
try
{
$res = $client->__soapCall("send",array($parametrs));
}
catch(Exception $e)
{
print_r($e->getMessage()); //Most of the time it prints could not connect to host
}
I changed SOAP from _1_1 to _1_2 but nothing changed.

Answer 1

This is how I call SOAP webservice, please note Service?wsdl should be Service.wsdl
Example
//Initialize values
$wsdl = "Service.wsdl";
$url = "http://x.x.x.x:x/gw/services/";
$username = "********"; //add username
$password = "********"; //add password
$client = new SoapClient("$url".$wsdl);
$params = array(
"username"=>$username,
"password"=>$password
);
$response = $client->UserLogIn($params); //UserLogIn is the function name
var_dump($response); // to see webservice response