I was checking the logs on the payment server ($server), and the requests are going through fine and returning a 200 response. I wrote the XML being returned to a log and it looks fine.

Content-Type: text/xml

<?xml version="1.0"?>
<PaymentResponse>
  <PAY_AVS_RESPONSE>Y</PAY_AVS_RESPONSE>
  <PAY_CVV2_RESPONSE>M</PAY_CVV2_RESPONSE>
  <PAY_AUTH_RESPONSE>APPROVED</PAY_AUTH_RESPONSE>
  <PAY_STATUS>1</PAY_STATUS>
  <PAY_APPROVAL>123456</PAY_APPROVAL>
  <PAY_RESPONSE>APPROVED</PAY_RESPONSE>
</PaymentResponse>
[download]

So it now appears that the payment server recieves the request fine, and response fine, but for some reason, when the requesting server recieves the response, something goes wrong, and I have no idea why. Hopefully this extra info will give someone else an idea.

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