I am getting this error no matter what card I use. I noticed the issue as my orders mysteriously stopped on Oct 5th. I havent changed anything on the site and my cc processing seems to be OK from their end. It's just that my site is not communicating at all with the gateway. I have even tried to generate a new gateway ID and that still does not work.
I am using NMI.
Zen Cart v1.3.8a/v1.3.8
Any help in the right direction is much appreciated.



