MIT personal web certificates expire periodically. Those obtained before September 1999 will expire December 31, 1999.
Certificates obtained after September 1999 will expire July 31, 2000. To check the expiration date of your MIT personal certificate, go to http://web.mit.edu/is/help/cert/certsexp.html and follow the instructions. If your personal certificate expires on December 31, renew as soon as possible to assure continued access to MIT secure web applications such as SAPweb, NECX, WebSIS, Benefits, Roles, etc.
A version of this article appeared in MIT Tech Talk on December 15, 1999.