Hi, n00b here!

I'm trying to enable Paypal IPN here at work for our store. Right now, I'm testing on our development server. It's only accessible on our network, so I thought that might be giving me problems. I did set up the module to point to the 'ipn_main_handler.php' on our live server, but that didn't fix anything.

This is the response I get:

Code:
Sep 26 2007 9:13 -- IPN INFO - Confirmation/Validation response
5 
FAIL
0
The payment goes through (not sure if it should or shouldn't), but the order isn't stored in Zen Cart. I've read through plenty of posts here, but couldn't find a solution that works for me.

Any help/suggestions are appreciated.

P.S. Using sandbox because we don't have a Paypal account set up here at work just yet.