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Duo Protection for DigiCert with Duo Access Gateway

Last Updated: February 9th, 2023

Duo offers a variety of methods for adding two-factor authentication and flexible security policies to DigiCert SSO logins, complete with inline self-service enrollment and Duo Prompt.

Duo Access Gateway reaches Last Day of Support on October 26, 2023 for Duo Essentials, Advantage, and Premier customers. As of that date Duo Support may only assist with the migration of existing Duo Access Gateway applications to Duo Single Sign-On. Customers may not create new DAG applications after May 19, 2022. Please see the Guide to Duo Access Gateway end of life for more details.

Use the Duo Single Sign-on for DigiCert application to protect DigiCert with Duo Single Sign-On, our cloud-hosted identity provider featuring Duo Central and the Duo Universal Prompt.


As business applications move from on-premises to cloud hosted solutions, users experience password fatigue due to disparate logons for different applications. Single sign-on (SSO) technologies seek to unify identities across systems and reduce the number of different credentials a user has to remember or input to gain access to resources.

While SSO is convenient for users, it presents new security challenges. If a user's primary password is compromised, attackers may be able to gain access to multiple resources. In addition, as sensitive information makes its way to cloud-hosted services it is even more important to secure access by implementing two-factor authentication and zero-trust policies.

Duo Access Gateway

Duo Access Gateway (DAG), our on-premises SSO product, layers Duo's strong authentication and flexible policy engine on top of DigiCert logins using the Security Assertion Markup Language (SAML) 2.0 authentication standard. Duo Access Gateway acts as an identity provider (IdP), authenticating your users using existing on-premises or cloud-based directory credentials and prompting for two-factor authentication before permitting access to DigiCert.

Duo Access Gateway is included in the Duo Premier, Duo Advantage, and Duo Essentials plans, which also include the ability to define policies that enforce unique controls for each individual SSO application. For example, you can require that Salesforce users complete two-factor authentication at every login, but only once every seven days when accessing DigiCert. Duo checks the user, device, and network against an application's policy before allowing access to the application.

Deploy or Update Duo Access Gateway

  1. Install Duo Access Gateway on a server in your DMZ. Follow our instructions for deploying the server, configuring DAG settings, and adding your primary authentication source.

  2. Add the attribute from the table below that corresponds to the Duo Mail attribute in the "Attributes" field when configuring your Active Directory or OpenLDAP authentication source in the DAG admin console. For example, if Active Directory is your authentication source, enter mail in the "Attributes" field.

    Duo Attribute Active Directory OpenLDAP
    Mail attribute mail mail

    If your organization uses another directory attribute than the ones listed here then enter that attribute name instead. If you've already configured the attributes list for another cloud service provider, append the additional attributes not already present to the list, separated by a comma.

  3. After completing the initial DAG configuration steps, click Applications on the left side of the Duo Access Gateway admin console.

  4. Scroll down the Applications page to the Metadata section. This is the information you need to provide to DigiCert when configuring SSO.

    DAG Metadata Information

Enable DigiCert SSO

DigiCert SSO is only available for CertCentral accounts. Please contact DigiCert support at to have SSO enabled for your account.

Continue with configuration once DigiCert enables SSO for your account.

Configure DigiCert SSO

Add the Duo Access Gateway as a new single sign-on provider for DigiCert.

  1. Log into DigiCert as an administrative user.

  2. On the left-hand navigation menu select Settings and then select Single Sign-On.

  3. On the "Single Sign-on (SSO)" page click Edit Federation Settings.

  4. On the "Federation Settings" page under "How will you send data from your IDP?" select Use a dynamic URL. A new text field will appear.

  5. Copy the Entity ID URL from the Duo Access Gateway admin console metadata display and paste it into the DigiCert Use a dynamic URL field.


  6. Select NameID for "How will you identify a user?".

  7. Type a unique name that will be used as part of your DigiCert login URL under "Federation Name".

  8. Once you've entered all required information click Save & Finish.

  9. The page will reload and ask you to test an SSO authentication to continue.

    DigiCert Single Sign-On Setting Edit

Learn more about DigiCert SSO at the DigiCert Support Center.

Create the DigiCert Application in Duo

  1. Log on to the Duo Admin Panel and navigate to Applications.

  2. Click Protect an Application and locate the entry for DigiCert with a protection type of "2FA with SSO self-hosted (Duo Access Gateway)" in the applications list. Click Protect to the far-right to start configuring DigiCert. See Protecting Applications for more information about protecting applications in Duo and additional application options.

  3. DigiCert uses the Mail attribute when authenticating. We've mapped Mail attribute to DAG supported authentication source attributes as follows:

    Duo Attribute Active Directory OpenLDAP SAML IdP Google Azure
    Mail attribute mail mail mail email mail

    If you are using a non-standard email attribute for your authentication source, check the Custom attributes box and enter the name of the attribute you wish to use instead.

  4. Click Save Configuration to generate a downloadable configuration file.

    Duo DigiCert Application Settings
  5. You can adjust additional settings for your new SAML application at this time — like changing the application's name from the default value, enabling self-service, or assigning a group policy — or come back and change the application's policies and settings after you finish SSO setup. If you do update any settings, click the Save Changes button when done.

  6. Click the Download your configuration file link to obtain the DigiCert application settings (as a JSON file).

    Important: This file contains information that uniquely identifies this application to Duo. Secure this file as you would any other sensitive or password information. Don't share it with unauthorized individuals or email it to anyone under any circumstances!

Add the DigiCert Application to Duo Access Gateway

Before you do this, verify that you updated the "Attributes" list for your Duo Access Gateway authentication source as specified here.

  1. Return to the Applications page of the DAG admin console session.

  2. Click the Choose File button in the "Add Application" section of the page and locate the DigiCert SAML application JSON file you downloaded from the Duo Admin Panel earlier. Click the Upload button after selecting the JSON configuration file.

  3. The DigiCert SAML application is added.

    DigiCert Application Added

Verify SSO

If your organization enabled the Duo Access Gateway portal, log into the portal page using the link provided by your administrator. Click DigiCert from the dashboard to access the application.

You can log on to DigiCert with IdP-initiated SSO via Duo Access Gateway using the Login URL provided by the DAG server when you created the DigiCert application in the DAG admin console (

DAG Login and Authentication Prompt

Congratulations! Your DigiCert users now authenticate using Duo Access Gateway.

Configure Allowed Hostnames

If you plan to permit use of WebAuthn authentication methods (security keys, U2F tokens, or Touch ID) in the traditional Duo Prompt, Duo recommends configuring allowed hostnames for this application and any others that show the inline Duo Prompt before onboarding your end-users.

The Duo Universal Prompt has built-in protection from unauthorized domains so this setting does not apply.

DigiCert does not support SP-initiated SSO login at this time.

Enforce SSO

By default DigiCert will allow you to sign in either with your username and password or SSO. You can modify this setting to mandate SSO for logging into DigiCert per user.

  1. While logged into DigiCert as an administrative user select Account on the left-hand navigation menu and then select Users.

  2. Click on the name of a user you'd like to enforce SSO for their login.

  3. On the user page under the "User Access" section check the box next to Only allow this user to log in through SAML SSO.

  4. Click Update User.

    DigiCert Enforce SSO

Microsoft AD FS

Microsoft's Active Directory Federation Services (AD FS) is a popular choice for SSO because it easily integrates with the AD identity store many organizations already have deployed. Duo's support for cloud applications and SSO drops in to an existing AD FS installation to provide secondary authentication after a user passes primary authentication (successful Active Directory logon).

If you don't already have AD federation running the first step is to install and configure Microsoft AD FS in your organization. Deployment Guides for AD FS versions 2.1, and 3.0/4.0 are available from Microsoft.

Once your AD FS services are up and running, the second step is to configure the SSO partnership between your AD FS service and the external cloud resource, in this case DigiCert. Learn more about configuring DigiCert SSO with AD FS at the DigiCert Support Center site.

After you have successfully configured and tested AD FS SSO login to DigiCert using your AD domain credentials, you can then install the Duo AD FS integration. AD FS protection is included with Duo's paid plans.

With the Duo integration for AD FS installed, users pass primary authentication to the AD FS service as usual. Once primary authentication succeeds, users are forwarded to the Duo service for secondary authentication. After approving logon using one of Duo's authentication methods, the user is fully logged in to DigiCert.

Other Identity Partners

Using a third-party SSO provider for cloud application access? Duo partners with leading cloud SSO providers like Okta and OneLogin to secure access with our strong and flexible authentication platform.

You can also use Duo two-factor authentication with CAS and Shibboleth on-premises IdPs.


Need some help? Try searching our Knowledge Base articles or Community discussions. For further assistance, contact Support.