cURL Timeout via browser - php

Question

I have a very weird situation. I have third party resource url which i am accessing through cURL. I am utilizing the same class from terminal and browser. It is working fine on terminal but I get error number 28 (timeout) when I access the same url and class from browser request via ajaxd.
I spent two days to debug but couldn't find anything.
What could be the problem?
UPDATE:
Following is the code:
$this->headers = [
"Content-type: text/xml;charset=\"utf-8\"",
"Accept: text/xml",
"Cache-Control: no-cache",
"Pragma: no-cache",
"Authorization: Basic c29hdXNlcjpzb2F1c2VyMTIz",
"SOAPAction: \"getTenantUnitDetails\"",
];
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $this->soapUrl);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, false);
curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
curl_setopt($ch, CURLOPT_TIMEOUT, 60);
curl_setopt($ch, CURLOPT_POST, true);
curl_setopt($ch, CURLOPT_POSTFIELDS, $this->requestBody); // the SOAP request
curl_setopt($ch, CURLOPT_HTTPHEADER, $this->headers);
$ch_response = curl_exec($ch);
if (curl_errno($ch)) {
print "Error: " . curl_error($ch);
}
return $ch_response;
UPDATE 2:
Here is the request from the browser which is not working.
Here is the request from terminal which is working.