![]() ![]() If you're using Windows 11 21H2, KB5010414 must be installed. If you're using Windows 10 21H2, KB5010415 must be installed. Patched Windows 10, version 21H2 or patched Windows 11 and later This requirement can be met using Azure AD multi-factor authentication, multi-factor authentication provided through AD FS, or a comparable solution. ![]() If you're using the hybrid cloud Kerberos trust deployment model, you must ensure that you have adequate (one or more, depending on your authentication load) Windows Server 2016 or later read-write domain controllers in each Active Directory site where users will be authenticating for Windows Hello for Business. There's more information on how Azure AD Kerberos works with Windows Hello for Business cloud Kerberos trust in the Windows Hello for Business authentication technical deep dive. More details on how Azure AD Kerberos enables access to on-premises resources are available in our documentation on enabling passwordless security key sign-in to on-premises resources. The same rules and restrictions used for RODCs apply to the Azure AD Kerberos Server object. This resource is only used by Azure Active Directory to generate TGTs for your Active Directory Domain. This object will appear as a Read Only Domain Controller (RODC) object but isn't associated with any physical servers. When you enable Azure AD Kerberos in a domain, an Azure AD Kerberos Server object is created in your on-premises AD. Kerberos service tickets and authorization continue to be controlled by your on-premises AD DCs. Windows can request a TGT from Azure AD when authenticating with Windows Hello for Business and use the returned TGT for logon or to access traditional AD-based resources. With Azure AD Kerberos, Azure AD can issue TGTs for one or more of your AD domains. cloud Kerberos trust uses Azure AD Kerberos that doesn't require any of the above PKI to get the user a TGT. Single sign-on (SSO) to on-premises resources from Azure AD-joined devices requires more PKI configuration to publish a certificate revocation list (CRL) to a public endpoint. This type of authentication requires PKI for DC certificates, and requires end-user certificates for certificate trust. Key trust and certificate trust use certificate authentication based Kerberos for requesting kerberos ticket-granting-tickets (TGTs) for on-premises authentication. Azure Active Directory Kerberos and Cloud Kerberos Trust Authentication Cloud Kerberos trust is the preferred deployment model if you do not need to support certificate authentication scenarios. Windows Hello for Business cloud Kerberos trust is recommended instead of key trust if you meet the prerequisites to deploy cloud Kerberos trust. Deploying Windows Hello for Business cloud Kerberos trust enables you to also deploy passwordless security keys with minimal extra setup.This change means there isn't a delay between the user provisioning and being able to authenticate Cloud Kerberos trust doesn't require syncing of public keys between Azure AD and on-premises domain controllers (DCs) for users to access on-premises resources and applications.Windows Hello for Business cloud Kerberos trust provides a simpler deployment experience because it doesn't require the deployment of public key infrastructure (PKI) or changes to existing PKI.Windows Hello for Business cloud Kerberos trust uses Azure Active Directory (AD) Kerberos to address pain points of the key trust deployment model: This deployment model can be used for new Windows Hello for Business deployments or existing deployments can move to this model using policy controls. The goal of the Windows Hello for Business cloud Kerberos trust is to bring the simplified deployment experience of on-premises SSO with passwordless security keys to Windows Hello for Business. ![]() ![]() The following deployment guide provides the information needed to successfully deploy Windows Hello for Business in a hybrid cloud Kerberos trust scenario. Windows Hello for Business replaces username and password Windows sign-in with strong authentication using an asymmetric key pair. ![]()
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