Time to update your MAC ID password

Beginning this spring McMaster will take steps to improve the security of MAC ID passwords. Specifically, faculty and staff who have a password which is more than a year old will be required to change their password. Henceforth, MAC ID passwords will expire automatically annually.

Passwords which are more than a year old will begin expiring in June. The backlog of expiries will be randomly spread through June and July to ease the transition.

Users are encouraged to pre-emptively change their MAC ID password now using Mosaic. Look either in the “My Profile” tab or in Main Menu >> MAC ID management tools. Users are advised to clear all saved instances of a MAC ID password before changing it. Saved passwords are often found in, for example, email programs/clients and Wi-Fi log-in credentials. Additional instructions are available at .

If you have any additional questions feel free to contact the Service Desk at 905-525-9140 extension 24357 or send email to