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The current default MIT Touchstone login page: 
The following page is normally briefly displayed to a user as the system redirects the user's browser back to the originally requested URL when the user has successfully authenticated to the MIT Touchstone login server, and has JavaScript enabled. If the user is on a slow network link this page may display for longer than the user expects.
Alternatively, when the user has disabled JavaScript, the following page is displayed after a successful authentication; the user will need to click on the Continue button to proceed back to the original site:
The user has five minutes to authenticate successfully from the login page (a timer on the page serves as a reminder of the time remaining). If the user attempts to authenticate after this time limit has been exceeded, the following error page is displayed: 
It is possible for the user to encounter the following error page. This should be very rare. I obtained this screen shot by using the Firefox extension "Tamper Data" and modifying the contents of the data being sent back to the login server when logging in using my username and password. 