Gateway Error Unable to Read Response or Response is Empty

Your server might have curl enabled, but it is still unable to reach the authorize.net server, or any other server for that matter.

First -- Check your phpinfo() readout and see if "curl_exec" is in the list of disabled_functions. Enlist the help of your hosting provider to get "curl_exec" allowed.

Alternatively -- Adjust the _trySetCurlAdapter function within Varien_Http_Client so it not only looks for whether lib_curl is enabled, but also checks whether curl_exec is allowed.

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