Duo (Two-Factor) Authentication

What is Duo?

Duo is a two-factor authentication (2FA) service that Dartmouth has rolled out to replace Security Questions on Dartmouth logins. Two-factor authentication with Duo is more secure, and easier than security questions.

We used to use security questions to provide an extra layer of protection — in addition to your password — between you and potential hackers. But security questions can be stolen too. Duo uses your cell phone or another registered device as a different kind of extra barrier between you and hackers.
After you enter your password, Duo will request additional verification from something that only you have access to: your smartphone, landline, or a Duo security token. If you don’t want to use your phone, we can help set up another authentication device — just contact us and ask!

Enrollment

To register a device, go to:

2FAenroll.dartmouth.edu

For more details see Dartmouth ITC's documentation: Two-Factor Authentication (2FA) with Duo

Common issues

Managing devices (new phone with same number or additional devices with different

These instructions apply if:

  • You have previously registered a cell phone in Dartmouth's Duo program and your phone has been replaced but you kept the same phone number OR
  • You need to add another device to a shared account.

These instructions can also be found on Duo's website at https://guide.duo.com/universal-enrollment#add-or-manage-devices

  1. Go to 2faenroll.dartmouth.edu
  2. After entering your netID and password do NOT do the Duo authentication you will be prompted for; instead click on Manage Devices

  3. You will be prompted to Duo again -- this time you should actually do it. You'll need to use a different device or accept a phone call or passcode texts to your phone.
  4. The next step depends on what you're trying to do:
    1. If you're replacing a phone on an existing number that's already in Duo, find your phone in your device list; click I have a new phone:
    2. If you're adding a new device to an account, then find the Add a device option, then choose Duo Mobile (if adding a smartphone):

  5. Follow the on-screen instructions from here