Error: Server Error when trying to access with a Google Apps account

[Will Reiher]

As of this morning I am unable to get access to our authenticated pages that require our google apps domain login. 

When logged out completely I do get the login screen and can successfully login - but upon redirection to the app the request stalls and finally issues a 500: Error: Server Error. This wasn't due to any changes I made - since I haven't updates these apps in a number of days.

The error comes up at this path:

_ah/conflogin?state=XXXX (I've removed the state)