I have no idea what's causing the errors.You'll need to fix whatever's causing the 500 error
I checked with my host to make sure that ports 80 and 443 were open, and that their firewall wasn't blocking any of Paypal's IP's. I checked my .htaccess files to make sure I wasn't blocking any of those IP's. Everything seems to be working.
Even my test order worked fine, got an email notification and a new order in my admin, however in Paypal's IPN history it's still "retrying".
Still, thanks for the help.



