[ic] SSL Internal Server Error 500

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Here is the situation:

We took on a project to rebuild a website for a client. They were using 
NetLedger for their eCommerce solution and we sold them on moving to 
Interchange. We ordered a new domain name, installed interchange and built 
the catalog. When all was said and done the decided they it was important to 
maintain their current domain name, and they didn't want us to simply park 
the old name on top of the new one, so I set up another hosting account and 
redirected their domain name to a new account, I installed interchange, and 
then I copied the catalog from the new domain to the old domain. (I used the 
instructions from the archive to the best I could).

Everything now seems to work fine except for SSL. I installed the 
certificate onto the site, went into my catalog.cfg file and changed the 
address for the secure server from http: to https: and rebooted interchange. 
I can browse and add things to my cart, but when I go to check out and 
interchange attempts to switch to https: - I bomb out with an Internal 
Server Error 500. I don't get anything related to this error in my 
interchange or catalog error logs.

As expected, my hosting company said that they can't support my third party 
shopping cart software and that I was tough out of luck. They did however 
say that my SSL certificate is correctly installed and functional. I have 
also verified it is functional outside of Interchange (https://mydomain.com 
works fine). The only problem is when I attempt to use SSL within 
interchange.

Any ideas? I searched the archive and didn't find anything that seemed to 
help.

Thanks,
Andy Melichar
Rebel2 Studios