I'm using the SIM method to allow payments on an apache server with a wordpress site. When SSL is not being used, these payments process 100% of the time. When SSL is used, however, authorize.net is unable to access the relay response URL that we've specified. The strange thing is that I don't even receive logs of the attempt. The page can be accessed via browser just fine, and all other SLL aspects of the site operate as normal. The error that I'm receiving means that either the site did not respond or it returned something other than a 200 code.
The fact that no logs are created when SSL is used really concerns me - is there anything else I can verify on my end that might be blocking a POST back to my site via SSL?