Error 6: curl can't resolve host name - php

Question

I'm running PHP 5.6.36 running on windows server 12R2 under IIS 8.5
Whenever I call this code I get an "error code: 6" echoed and an empty $responseText, although I'm able to reach this address with the browser.
I've tried toggling the CURLOPT_SSL_VERIFYPEER and CURLOPT_SSL_VERIFYHOST to true settings and using https:// addresses, but to no avail. Don't get why I can reach these addresses through the browser, but not from the command line.
function genericGet($url,$userName,$passWord){
//overriding $url for the purposes of test
$url = "http://www.google.com";
$reqDefaults = array(
CURLOPT_URL => $url,
CURLOPT_POST => false,
CURLOPT_HEADER => false,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_SSL_VERIFYHOST => false,
CURLOPT_HTTPAUTH => CURLAUTH_BASIC,
CURLOPT_USERNAME => $userName,
CURLOPT_PASSWORD => $passWord
);
$curlReq = curl_init();
$responseText = curl_exec($curlReq);
echo "error code:".curl_errno($curlReq)."\r\n";
curl_close($curlReq);
return $responseText;
}

Answer 1

Ok so I finally worked this out. There was an application proxy running on the server. I checked the internet settings in Firefox and found the proxy address then added the CURLOPT_PROXY setting to my setopt array and it worked. Final code looked like this:
function genericGet($url,$userName,$passWord){
//overriding $url for the purposes of test
$url = "http://www.google.com";
$reqDefaults = array(
CURLOPT_URL => $url,
CURLOPT_POST => false,
CURLOPT_HEADER => false,
CURLOPT_SSL_VERIFYPEER => false,
CURLOPT_RETURNTRANSFER => true,
CURLOPT_SSL_VERIFYHOST => false,
CURLOPT_HTTPAUTH => CURLAUTH_BASIC,
CURLOPT_USERNAME => $userName,
CURLOPT_PASSWORD => $passWord,
CURLOPT_PROXY => 'proxyaddress:8080'
);
$curlReq = curl_init();
$responseText = curl_exec($curlReq);
echo "error code:".curl_errno($curlReq)."\r\n";
curl_close($curlReq);
return $responseText;
}