Internal Server Error using Authorize.net

[ejac4031]

This is a new ShopSite Manager that I just set up. Everything is working properly except the checkout. I'm using the Authorize.Net payment gateway. I have configured it properly using the API Login ID and Transaction Key. However, each time I complete the checkout process on the last page after the credit card information has been entered I get an Internal Server Error.

I have already verified the correct information with Authorize.Net as well as checked the checkout process without using Authorize.Net. When processing without the gateway orders go through. But I need to use the Authorize.Net gateway.

This is a dedicated server running Plesk 8 on Linux. Any help would be greatly appreciated. Thank you!

[Jim]

Please escalate this through the ISP where your store is hosted. If they cannot help you they can escalate it to the ShopSite support team. If your store is not hosted with a partner you can purchase a support incident at http://shopsite.com/support_pricing.html