xenforo 1.5.8 My tech added the following: site is using HHV version 3.9.1. mbstring PHP is installed
Do you by chance have a test environment that is running PHP itself (not HHVM)? I'm not even sure if XenForo is fully compatible with HHVM.
Not really sure what could even be tested/fixed there to be honest. The plugin relies on the XenForo HTTP Client, which is really just a wrapper for the Zend HTTP Client. So either the server you are trying to connect to is acting whacky (I'm pretty sire we would have heard about it by now if Google's API servers couldn't be connected to properly, so I doubt that's the case). The other possibility is just that your PHP setup isn't able to handle socket connections as done by XenForo/Zend.