XF 1.2 Unable to read response, or response is empty [Error Log]

[Divvens]

The following error popped up today, I'm not hiding the E-Mail within since its a spam bot/reported ip/reported mail.

Is it something to do with Gravatar? That's what I'm guessing, but I'm not sure so I thought it's best to post it here.

Zend_Http_Client_Exception: Unable to read response, or response is empty - library/Zend/Http/Client.php:993
Generated By: Unknown Account, Today at 10:57 AM

Stack Trace
#0 /home/orojacks/public_html/library/XenForo/Model/Avatar.php(457): Zend_Http_Client->request('HEAD')
#1 /home/orojacks/public_html/library/XenForo/ControllerPublic/Register.php(219): XenForo_Model_Avatar::gravatarExists('Gayne3814@gmail...')
#2 /home/orojacks/public_html/library/XenForo/FrontController.php(337): XenForo_ControllerPublic_Register->actionRegister()
#3 /home/orojacks/public_html/library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#4 /home/orojacks/public_html/index.php(13): XenForo_FrontController->run()
#5 {main}

Request State
array(3) {
  ["url"] => string(39) "http://orojackson.com/register/register"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(17) {
    ["username"] => string(10) "AtBtIhRgoa"
    ["email"] => string(19) "Gayne3814@gmail.com"
    ["password"] => string(8) "********"
    ["password_confirm"] => string(8) "********"
    ["dob_month"] => string(1) "8"
    ["dob_day"] => string(2) "24"
    ["dob_year"] => string(4) "1979"
    ["gender"] => string(4) "male"
    ["custom_fields"] => array(1) {
      ["ProfileCover"] => string(0) ""
    }
    ["custom_fields_shown"] => array(1) {
      [0] => string(12) "ProfileCover"
    }
    ["timezone"] => string(15) "America/Caracas"
    ["captcha_question_answer"] => string(0) ""
    ["captcha_question_hash"] => string(40) "0a57a6ec067dac364334e2973e3fc7317f04b10b"
    ["agree"] => string(1) "1"
    ["submit"] => string(7) "Sign Up"
    ["_xfToken"] => string(8) "********"
    ["reg_key"] => string(32) "1705d54f414cdb652566b4fd5eef7097"
  }
}

 

[Mike]

Yes, it's Gravatar. If it happens once or infrequently, you can ignore it; that indicates an issue with the service or your connection to it. If it happens constantly, that's generally an issue with an outgoing firewall.