MIT Wiki has changed its access control from simple user id password to a touchstone collaboration account. 

Go to http://wikis.mit.edu

Click on Log In link on top right of the page.

You will see the following page.

 

Click on Go to TouchStone button

Click on Sign Up link, just below option b. Touchstone collaboration Account.

re-register with the SAME ID (E-Mail Address) you used in the earlier Wiki security setup. You can use a different password.

Enter your details in this page and click on Create Account button

You will see a confirmation page. 

You will receive a confirmation email from touchstone-support@MIT.EDU.  Click on the link in this email and the account will be enabled.

Even though NEW non-mit users can register to MIT wiki directly, in order to get access to Coeus project in the MIT wiki, users should register with help@coeus.org.