I am running into the same issue with GoDaddy and authorize.net aim. The error message I keep getting now is "lost network connection." (NSURLErrorDomain:-1005). I am running the latest version of zenCart. This is what I have in my authizenet_aim.php file:

if (CURL_PROXY_REQUIRED == 'True') {

curl_setopt ($ch, CURLOPT_HTTPPROXYTUNNEL, true);

curl_setopt ($ch, CURLOPT_PROXYTYPE, CURLPROXY_HTTP);

curl_setopt ($ch, CURLOPT_PROXY, '64.202.165.130:3128');

}



$authorize = curl_exec($ch);

curl_close ($ch);

Any ideas as to what the problem might be?