Using a Duo App Passcode for Two-step Login When Your Device Does Not Have Internet or Cell Service

If your device doesn't have wifi/cell service, you can still use DUO on it through offline passcodes.

Audience: Faculty, Staff and Students

This KB Article References: Duo Security Two-Step Login, VPN
This Information is Intended for: Faculty, Staff, Students
Last Updated: October 30, 2020
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The recommended way to set up two-step login with Duo Security is to use push notifications on a smartphone utilizing the Duo Push App. Push notifications are pop-up notifications that appear on your smartphone or tablet's home screen. You may get them as calendar reminders, notifications for email, sales, or games, etc. They are connected to the apps that you use on your smartphone or tablet. When you get a Push Notification from the Duo App, you'll be prompted to approve the authentication. And they require internet or cell service to work/appear.

If your device does not have internet or cell service, it will not receive push notifications to complete the two-step login process, but the Duo App provides another way to log in, via offline passcodes. So that you're ready to use offline passcodes if needed, be sure to prepare your device and account before you need to use offline codes (e.g., before travelling).

Prepare Your Device

Getting and Using Passcodes

Troubleshooting

Prepare Your Device

Before you expect to use offline passcode, prepare you device(s) and DUO account:

  1. Download and activate the DUO app on any mobile device (tablet, mobile phone) from which you might need offline passcodes by logging in to manage your devices
  2. Set up your device so you can choose which device to authenticate with each time
  3. Once you've set up your device and account, test that the offline passcodes work:
    1. Turn off wifi/cell service on your device 
    2. Open the DUO app on the mobile device you set up
    3. On a separate device (still connected to the wifi/cell service) go to the Duo Self-service Portal and tap Enter a Passcode
      enter a passcode duo self service portal
    4. Enter the passcode from your app and click Log In
       enter passcode from duo app
    5. Repeat steps a-d on every device you might need to use offline (e.g., devices you will have when you travel)
    6. If a device has issues, see troubleshooting below

Getting and Using the Duo App Passcodes from your Offline Device

  1. Prior to logging into a system that requires two-step login, tap Duo App on a mobile device or tablet you set up above
  2. Tap "Stony Brook University" , and you will see a 6-digit number (even if you are offline). Remember that passcode.
    offline duo app with passcode
  3. Log into the system that requires two-step login (for example, with your NetID and NetID password)
  4. When prompted to choose how to authenticate, for Device, select the device you opened the DUO app on in step 1 then tap Enter a Passcode
    Enter a passcode
  5. Enter the passcode you remembered/see in DUO app from step 2, and tap Log In
    If you see a message that the passcode has already been used, back in the DUO app on your device, click the refresh button refresh button to create a new passcode; refresh works even while your device is offline
    enter passcode

Troubleshooting

If the passcodes from a device's DUO app don't work, reactivate the device in the DUO self-service portal while your device is connected to the internet.

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