I'm trying to get an Authorizenet AIM module working for a client. Authorize is in test mode as well as ZC. Here are the ZC (1.3.7) settings:

Enable Authorize.net (AIM) Module
True

Login ID
--valid--

Transaction Key
--valid--

Transaction Mode
Test

Authorization Type
Authorize

Enable Database Storage
False

Customer Notifications
True

Merchant Notifications
True

Request CVV Number
True

Store the Credit Card Number
False

Sort order of display.
0

Payment Zone
--none--

Set Order Status
default

Debug Mode
Log File

Each time I try to process one of the dummy card numbers, the site just turns it's wheels for about a minute and then spits out a "I can't find this page" page. I had read in another post that Authorize requires the info to be sent within 10 seconds or it will timeout. This site is running slow so I thought that might be an issue. I also saw a discussion about hard coding Authorize's test servers to make things work coorectly, but it seems like if I have ZC setup in test mode that it would automatically use the Authorize test server. Am I wrong?

I appreciate any help everyone can give.