# Authenticate to Microsoft Entra ID using Application Identity
Entra Connect uses the [Microsoft Entra Connector account](entra/identity/hybrid/connect/reference-connect-accounts-permissions#accounts-used-for-microsoft-entra-connect.md) to authenticate and sync identities from Active Directorty to Entra ID. This account uses username and password to authenticate requests. To enhance the security of the service, we are rolling out an application identity that uses Oauth 2.0 client credential flow with certificate credentials. In this new method, Entra or Administrator will create a single tenant 3rd party application in Entra ID and use one of the relevant certificate management options below for the credentials.
Microsoft Entra Connect provides 3 options for application/certificate management:
:::image type="content" source="media/authenticate-application-id/auth-1.png" alt-text="Diagram of authentication with application id." lightbox="media/authenticate-application-id/auth-1.png":::
Microsoft recommendeds the Entra Connect certificate management option as we manage the keys and automatically rotate the certificate on expiry. This is the default option in Entra Connect Sync versions equal to or higher than 2.4.252.0. Note that we use the maintenance task to check if the certificate is due for rotation and automatically rotate the certificate, so if the scheduler is suspended or maintenance task is disabled, auto rotation will not happen even though the certificate is managed by Entra Connect sync
The Microsoft Entra Managed is set up during initial installation or upgrade process on the Entra Connect Connect Wizard as shown below
*Installation Wizard Image*
This can also be set up during a second pass on the wizard as shown below
*Second pass Wizard image*
# Authenticate to Microsoft Entra ID using Application Identity
Entra Connect uses the [Microsoft Entra Connector account](reference-connect-accounts-permissions#accounts-used-for-microsoft-entra-connect.md) to authenticate and sync identities from Active Directorty to Entra ID. This account uses username and password to authenticate requests. To enhance the security of the service, we are rolling out an application identity that uses Oauth 2.0 client credential flow with certificate credentials. In this new method, Entra or Administrator will create a single tenant 3rd party application in Entra ID and use one of the relevant certificate management options below for the credentials.
Microsoft Entra Connect provides 3 options for application/certificate management:
:::image type="content" source="media/authenticate-application-id/auth-1.png" alt-text="Diagram of authentication with application id." lightbox="media/authenticate-application-id/auth-1.png":::
Microsoft recommendeds the Entra Connect certificate management option as we manage the keys and automatically rotate the certificate on expiry. This is the default option in Entra Connect Sync versions equal to or higher than 2.4.252.0.
> [!NOTE]
> We use the maintenance task to check if the certificate is due for rotation and automatically rotate the certificate, so if the scheduler is suspended or maintenance task is disabled, auto rotation will not happen even though the certificate is managed by Entra Connect Sync.
The Microsoft Entra Connect Sync managed application and credential is automatically set up during initial installation as shown below
*Installation Wizard Completion Image*
In the case of manual upgrade, the administrator must explicitly opt in to application identity as shown below