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Novaz AuthenticatorGET

Dynu 2FA: how to set up an authenticator app

By the Novaz team · Updated October 29, 2026
Novaz steps checked against version 1.0.5

On this page
  1. Turn on 2FA with an authenticator app
  2. Save your backup codes
  3. When Dynu asks for a code
  4. If Dynu rejects your code
  5. Changing phones
  6. If you lose your authenticator
  7. Turning 2FA off
  8. Official Dynu help

Your Dynu account opens the Control Panel, where you manage dynamic DNS hostnames, domains and email services. Some people hold off on two-factor authentication (2FA) for fear it will break the router or client that keeps their hostname pointed at their IP address. It won't. Dynu asks for a code only when you sign in to its website, and IP updates keep working with your account password or a separate IP update password (Dynu).

Dynu's setup screen asks for a TOTP app and gives Google Authenticator and Duo as examples (Dynu). Its posts mention text messages only when explaining 2FA in general, and never describe a text-message option for Dynu accounts. This guide uses Authenticator App - Novaz on iPhone. Any authenticator app works the same way.

How we checked this guide: the Dynu steps come from Dynu's own blog posts and the screenshots in them, linked below. dynu.com wouldn't load for our automated reader, so on October 20, 2026 we read archived copies on web.archive.org, saved in 2026 (the backup-codes screenshot only in a 2021 copy). The posts date from 2017 to 2023, so labels may have changed since. We haven't tested the steps on a Dynu account. The Novaz steps are checked against the app, version 1.0.5.

Turn on 2FA with an authenticator app

Dynu's posts give the route, and a screenshot shows the page (Dynu, Dynu):

  1. Sign in to the Dynu Control Panel and go to My Account. (Dynu's 2017 post says Manage Credentials; its newer posts say My Account.)
  2. Click Two Factor Authentication. The page that opens is headed Enable Two Factor Authentication and shows a QR code next to a text key, which Dynu calls the authentication key.
  3. In Novaz, tap +, then Scan QR code, and point the camera at the QR code. If the Control Panel is open on the same iPhone, take a screenshot, then tap + and Choose a photo. See scanning a QR code on the same iPhone.
  4. To type the key instead, tap +, then Enter key manually. Put Dynu as the Service, your username as the Account if you like, and the authentication key as the Setup key. See What is a 2FA setup key?
  5. Type the 6-digit code from Novaz in the Code box and click Enable.

Dynu doesn't say how often its codes change, so scanning is the safer choice: the QR code carries the code settings, while a typed key always gets 6 digits every 30 seconds.

Dynu's 2017 post also suggests writing down the authentication key at setup, so you can add the account to an app on another device later (Dynu). Guard it like your password: anyone with the key can make your codes.

Save your backup codes

Dynu gives you a dozen one-time backup codes for when you can't reach your phone. It asks you to download them and store them somewhere safe, and to get them now if you skipped that step at setup (Dynu). Its screenshot shows where to find them once 2FA is on: a Two Factor Authentication Backup Codes link at the bottom of the Two Factor Authentication page.

Without a Novaz backup (iCloud backup or a backup file), the keys exist only on your iPhone, so these codes (and the key, if you wrote it down) are your way back in. Keep them off your phone, in a password manager or on paper. Dynu's pages don't show where to type a backup code at sign-in. More in 2FA backup codes.

When Dynu asks for a code

Each time you sign in to Dynu's website, you need a new code from the app (Dynu). Dynu's pages don't mention remembering a trusted browser.

Your router, ddclient or Dynu's update client never needs the code. For IP updates, Dynu suggests an IP Update Password for the whole account, set in the Change Username/Password section of My Account, or group passwords for selected hostnames (Dynu, Dynu).

If Dynu rejects your code

None of Dynu's posts says what to do when a code is refused. Time-based codes depend on your phone knowing the exact time, so start there. If Novaz shows a warning that the clock is 15 seconds or more off, go to Settings > General > Date & Time on the iPhone and switch on Set Automatically. If the clock is fine, work through Authenticator code not working?

Changing phones

Dynu doesn't describe a phone-change step. If you kept the authentication key, add it to the app on the new phone. If not, sign in while the old phone still works, turn 2FA off, and set it up again on the new one. If you have a Novaz iCloud backup or backup file, restoring it on the new iPhone is simpler still. See How to transfer your authenticator app to a new iPhone.

If you lose your authenticator

Sign in with one of your backup codes. If those are gone too, open a support ticket: Dynu's staff confirm the account is yours with questions about it and proof of identity. Dynu promises "you will never be locked out of your account by turning on 2FA" (Dynu), but doesn't say which documents it accepts or how long this takes. Its Contact Us form works without signing in.

More in Lost the phone with your authenticator app?

Turning 2FA off

Go back to Two Factor Authentication under My Account. With 2FA on, the page is headed Disable Two Factor Authentication. Click Disable. Dynu's screenshot warns that your account is then protected by your password alone (Dynu).

Official Dynu help

We read each of these as an archived copy on web.archive.org.

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