I set an incorrect value for 'idp storage path' and the plugin failed to configure but it still attempted to serve SAML2 requests, failing with a 500 error:

[Wed Aug 26 11:06:56.885840 2015] [wsgi:error] [pid 32623] [26/Aug/2015:11:06:56] DEBUG(ipsilon/providers/common.py:93 Redirect.debug()): saml2: 'NoneType' object has no attribute 'get_login_handler'
[Wed Aug 26 11:06:56.888788 2015] [wsgi:error] [pid 32623] [26/Aug/2015:11:06:56] DEBUG(ipsilon/util/errors.py:18 Errors.handler()): ['500 Internal Server Error', 'The server encountered an unexpected condition which prevented it from fulfilling the request.', 'Traceback (most recent call last): File "/usr/lib/python2.7/site-packages/cherrypy/_cprequest.py", line 656, in respond response.body self.oldhandler(args, kwargs) File "/usr/lib/python2.7/site-packages/cherrypy/_cpdispatch.py", line 34, in call return self.callable(self.args, self.kwargs) File "/usr/lib/python2.7/site-packages/ipsilon/util/page.py", line 91, in call return op(*args, kwargs) File "/usr/lib/python2.7/site-packages/ipsilon/providers/common.py", line 87, in root return op(args, *kwargs) File "/usr/lib/python2.7/site-packages/ipsilon/providers/saml2idp.py", line 79, in GET login = self.saml2login(query) File "/usr/lib/python2.7/site-packages/ipsilon/providers/saml2/auth.py", line 118, in saml2login raise cherrypy.HTTPError(500)HTTPError: (500, None)', '3.2.2']

It also tracebacks if the certificate or key cannot be loaded.

This issue ticket was originally removed from the tracker as it clashed with the pull request.
See upstream ticket for migration details.