Re: Authorize.net module suddenly quit working communications error
Maybe enable "debug mode to logfile" within the Auth.net AIM module, test a transaction to the point of failure and then attach the contents of the associated error log (within CODE tags) The # symbol in the formatting menu just above where you type the response.
That might be more helpful than the error displayed onscreen.
Installing lat9's debug backtrace will also show additional debug information
https://www.zen-cart.com/downloads.php?do=file&id=1879
Rick
RixStix (dot) com
aka: ChainWeavers (dot) com