# Using a second Factor (Duo App, Desktop App, HW Token)

<p class="callout info">The Connection to OWA and SSO is the Same. OWA is just used an example here. So if you have problems to sign in on your SSO you may also follow these steps.</p>

## Use of the DUO Desktop Application

<p class="callout info">To setup the Duo Desktop Application click **[here](https://books.rz.tu-bs.de/books/two-factor-authentication-2fa-with-duo-english-version/page/set-up-desktop-application)**.</p>

#### OWA

<table border="1" id="bkmrk-bitte-%C3%B6ffnen-sie-den-1" style="border-collapse: collapse; width: 100%; height: 529.467px;"><tbody><tr style="height: 470.267px;"><td style="height: 470.267px;">[![90e49996-1316-4091-864e-07975b0a2e06.png](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/scaled-1680-/G0F6lb0GrfmDVCc8-90e49996-1316-4091-864e-07975b0a2e06.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/G0F6lb0GrfmDVCc8-90e49996-1316-4091-864e-07975b0a2e06.png)

</td><td style="height: 470.267px;">You may open the link [<span style="letter-spacing: 0.0px;">https://mail.tu-braunschweig.de</span>](https://mail.tu-braunschweig.de) and register with your TUBS ID and the attached password.

  
After that the **Duo Desktop App** will open up in a small window, to confirm your login click **Approve.**

<p class="callout warning">Make Sure the Data is correct before approving!</p>

</td></tr><tr style="height: 29.6px;"><td style="height: 29.6px;">[![grafik.png](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/scaled-1680-/KfuSsCbhtE7RSIbg-grafik.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/KfuSsCbhtE7RSIbg-grafik.png)

</td><td style="height: 29.6px;"><p class="callout warning">If Duo Push is already setup just click "Weitere Optionen" and select **Duo Desktop App**</p>

</td></tr></tbody></table>

#### VPN

<table border="1" id="bkmrk-wenn-sie-die-duo-des" style="border-collapse: collapse; width: 100%;"><tbody><tr><td>[![{5936395E-113B-4C99-A599-0179FA519200}.png](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/scaled-1680-/xJ6mIGAvoM906bKV-5936395e-113b-4c99-a599-0179fa519200.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/xJ6mIGAvoM906bKV-5936395e-113b-4c99-a599-0179fa519200.png)

</td><td>If you want to connect to the VPN with help of your Duo Desktop App, you may connect via the VPN gateway "vpngate.tu-braunschweig.de/saml" to connect to the network of the TU Brunswig</td></tr><tr><td>[![90e49996-1316-4091-864e-07975b0a2e06.png](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/scaled-1680-/XazChkHTAXuKP3XM-90e49996-1316-4091-864e-07975b0a2e06.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/XazChkHTAXuKP3XM-90e49996-1316-4091-864e-07975b0a2e06.png)

</td><td>After you will choose the option Duo Desktop as second factor and approve the correctness of your data by clicking "Approve".</td></tr><tr><td>[![{1BB89643-77AE-4090-9541-4856A05DC8AC}.png](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/scaled-1680-/yEtWgu0af5taAKLI-1bb89643-77ae-4090-9541-4856a05dc8ac.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/yEtWgu0af5taAKLI-1bb89643-77ae-4090-9541-4856a05dc8ac.png)

</td><td>At last you will click "Annehmen" to automatically connect with the VPN. Done!</td></tr></tbody></table>

## Use of the HW-Tokens

Users who have received a hardware token (Duo Token) don't need to do anything further to use the second factor. It has already been linked to the TUBS ID and can be used immediately for logging into OWA, SSO, and VPN (via vpngate.tu-braunschweig.de, see below). Users who want to use the **Duo Mobile App** can find instructions [here](https://books.rz.tu-bs.de/books/zwei-faktor-authentifizierung-2fa-mit-duo/page/app-einrichten-mobiles-endgerat "2FA einrichten") for first-time setup.

#### OWA  


<table border="1" id="bkmrk-please-open-the-link" style="border-collapse: collapse; width: 100%;"><tbody><tr><td>[![Outlook_Anmeldung.png](https://books.rz.tu-bs.de/uploads/images/gallery/2024-03/scaled-1680-/K2C5vXwBSzVYPSYQ-outlook-anmeldung.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2024-03/K2C5vXwBSzVYPSYQ-outlook-anmeldung.png)  
</td><td>- <span style="letter-spacing: 0.0px;">Please open the link [https://mail.tu-braunschweig.de](https://mail.tu-braunschweig.de)</span><span style="letter-spacing: 0.0px;"> and log in normally with your TUBS ID and password.</span>

</td></tr><tr><td>[![UE34xf0ixSE1pgIC-hwtoken2.png](https://books.rz.tu-bs.de/uploads/images/gallery/2024-02/scaled-1680-/IFwWIC1hmBkSxMPL-ue34xf0ixse1pgic-hwtoken2.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2024-02/IFwWIC1hmBkSxMPL-ue34xf0ixse1pgic-hwtoken2.png)  
</td><td>- <span style="letter-spacing: 0.0px;">Next, another window will open where you enter the 6-digit PIN generated via the HW token.</span>

</td></tr></tbody></table>

#### <span style="letter-spacing: 0.0px;">VPN</span>

<table border="1" id="bkmrk-wer-2-faktor-authent-2" style="border-collapse: collapse; width: 100%;"><tbody><tr><td>[![{CA20555A-1EF5-41F2-9CEF-CBD8D39F5207}.png](https://books.rz.tu-bs.de/uploads/images/gallery/2025-12/scaled-1680-/U1CXUgdILNsG7iyB-ca20555a-1ef5-41f2-9cef-cbd8d39f5207.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2025-12/U1CXUgdILNsG7iyB-ca20555a-1ef5-41f2-9cef-cbd8d39f5207.png)

  
</td><td>To use two-factor authentication for VPN login, you must log in to a different VPN gateway than before. This means that in the field that currently displays "SSL VPN" or "vpngate.tu-bs.de" (or similar), you must enter

**vpngate.tu-braunschweig.de**

  
Then enter your TUBS ID in the fiel labeled "Benutzername"

</td></tr><tr><td>[![VPN_Token.png](https://books.rz.tu-bs.de/uploads/images/gallery/2025-12/scaled-1680-/mYJPgZrnEXEmSFds-vpn-token.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2025-12/mYJPgZrnEXEmSFds-vpn-token.png)</td><td>When prompted for your password, enter your password followed by a comma and then the generated PIN.

</td></tr></tbody></table>

## Using the DUO App (on mobile device)

#### OWA  


<table border="1" id="bkmrk-bitte-%C3%B6ffnen-sie-den" style="border-collapse: collapse; width: 100%; height: 685.4px;"><tbody><tr style="height: 655.8px;"><td style="height: 655.8px;">[![619a4f21-a442-4700-bb81-b15d0bfd0e9f.png](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/scaled-1680-/Epa0npw70stZI0SJ-619a4f21-a442-4700-bb81-b15d0bfd0e9f.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/Epa0npw70stZI0SJ-619a4f21-a442-4700-bb81-b15d0bfd0e9f.png)

</td><td style="height: 655.8px;">Please open the link [https://mail.tu-braunschweig.de](https://mail.tu-braunschweig.de) and log in as usual with your TUBS ID and password.

Next, you will see a notification that Duo has sent a push notification to the registered device.

</td></tr><tr style="height: 29.6px;"><td style="height: 29.6px;">[![grafik.png](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/scaled-1680-/BnryzJwXQkmoTdGW-grafik.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2026-02/BnryzJwXQkmoTdGW-grafik.png)

</td><td style="height: 29.6px;">Once you open the Duo Mobile App on your device you will have to enter the shown code and click verify. Done! Make Sure the shown Data is correct.

</td></tr></tbody></table>

#### <span style="letter-spacing: 0.0px;">VPN  
</span>

<table border="1" id="bkmrk-wer-2-faktor-authent" style="border-collapse: collapse; width: 100%;"><tbody><tr><td>[![{CA20555A-1EF5-41F2-9CEF-CBD8D39F5207}.png](https://books.rz.tu-bs.de/uploads/images/gallery/2025-12/scaled-1680-/jja6mbkhDgTNYth5-ca20555a-1ef5-41f2-9cef-cbd8d39f5207.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2025-12/jja6mbkhDgTNYth5-ca20555a-1ef5-41f2-9cef-cbd8d39f5207.png)

  
</td><td>To use two-factor authentication for VPN login, you must log in to a different VPN gateway than before. This means that in the field that currently displays "SSL VPN" or "vpngate.tu-bs.de" (or similar), you must enter

**vpngate.tu-braunschweig.de**

  
Then enter your TUBS ID as usual.

</td></tr><tr><td>[![VPN.png](https://books.rz.tu-bs.de/uploads/images/gallery/2025-12/scaled-1680-/SaN2Hwab20FPeA0c-vpn.png)](https://books.rz.tu-bs.de/uploads/images/gallery/2025-12/SaN2Hwab20FPeA0c-vpn.png)</td><td>When using the Duo app, you only need to enter your password. Then, a push notification is sent to the app, which you must confirm within the app</td></tr></tbody></table>