IPN 500 Error--Not database, not dev server, not SSL...

[Nick]

Yeah, I know. More IPN confusion.

The PayPal tool is telling me that there's an internal server error (500) at my IPN. It's not the database rebuild--I did that--and it's not the development server, as I have my development server on RackSpace.

(1) SSL is not enabled on my development server, but I expect that this is not the issue because setting the IPN endpoint to https://... leads to "IPN delivery failed. Unable to connect to the specified URL. Please verify the URL and try again." but taking out the s leads to "IPN delivery failed. HTTP error code 500: Internal Server Error."

(2) Could it be my urls? It looks something like:

urlpatterns = patterns('',

    url(r'^admin/', include(admin.site.urls)),

    

    url(r'^blah_blah_blah/$', blah_blah_blah),

    (r'^ipn_endpoint/$', include('paypal.standard.ipn.urls')),

)

If it were, I'd expect it to throw a 404...

(3) The error I'm getting in my Apache error log is:

[Mon Jun 20 03:17:39 2011] [error] [client 216.113.191.33] mod_wsgi (pid=9136): Exception occurred processing WSGI script '/path/to/my/wsgi/config.wsgi'.

[Mon Jun 20 03:17:39 2011] [error] [client 216.113.191.33] IOError: failed to write data

(4) Installed Apps include INSTALLED_APPS = (

    'paypal.standard',

    'paypal.pro',

    'paypal.standard.ipn',

    ...

)

(5) python manage.py test ipn  actually did pass once, but usually fails. When it fails:

======================================================================

FAIL: test_duplicate_txn_id (paypal.standard.ipn.tests.test_ipn.IPNTest)

----------------------------------------------------------------------

Traceback (most recent call last):

  File "/usr/local/lib/python2.6/dist-packages/django_paypal-0.1.2-py2.6.egg/paypal/standard/ipn/tests/test_ipn.py", line 124, in test_duplicate_txn_id

    self.assertEqual(ipn_obj.flag, True)

AssertionError: False != True

----------------------------------------------------------------------

I have no idea why it would have passed that one time. Any idea what this means or how I can remedy this?

Thanks so much for your help.

Best,

Nick