Has anyone successfully been able to connect to test.authorize.net? I'm
having the same issue there as well. moving to secure2.authorize.net
fixed production though thankfully
I posted a solution here:
http://community.developer.authorize.net/t5/The-Authorize-Net-Developer-Blog/Authorize-Net-Begins-Infrastructure-and-SHA-2-Certificate/bc-p/50166#M445
