:::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 recommends the Entra Connect certificate management option as we manage the keys and automatically rotate the certificate on expiry. This behavior 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 won't happen even though the certificate is managed by Entra Connect Sync.
## Bring Your Own Application (BYOA)
In this set up, the customer administrator manages the application that is used by Entra Connect Sync to authenticate to Entra, the application permissions and certificate credential used by the application. The administrator [registers a Microsoft Entra app and creates a service principal.](/graph/tutorial-applications-basics?tabs=http#register-an-application-with-microsoft-entra-id). The application should be assigned the required [permissions](#microsoft-graph-permissions-for-byoa)
## Bring Your Own Certificate (BYOC)
>
> Following up on our earlier [Whatโs New](../../../fundamentals/whats-new.md#general-availability---download-microsoft-entra-connect-sync-on-the-microsoft-entra-admin-center) communication, new versions of Microsoft Entra Connect Sync are only available on theโฏ[Microsoft Entra Connect blade](https://entra.microsoft.com/#view/Microsoft_AAD_Connect_Provisioning/AADConnectMenuBlade/%7E/GetStarted) within Microsoft Entra Admin Center and will no longer be released to the [Microsoft Download Center](https://www.microsoft.com/en-us/download/details.aspx?id=47594).
- [Microsoft Entra Connect](https://www.microsoft.com/download/details.aspx?id=47594) version [2.4.252.0](reference-connect-version-history.md) or greater.
- Microsoft Entra account with at least a [Hybrid Identity Administrator](../../role-based-access-control/permissions-reference.md#hybrid-identity-administrator) role.
- On-premises Active Directory Domain Services environment with Windows Server 2016 operating system or later.
- Optional: TPM 2.0 present and ready to use (recommended for security)
:::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 recommends the Entra Connect certificate management option as we manage the keys and automatically rotate the certificate on expiry. This behavior is the default option in Entra Connect Sync versions equal to or higher than 2.5.2.0.
> [!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 won't happen even though the certificate is managed by Entra Connect Sync.
## Bring Your Own Application (BYOA)
In this set up, the customer administrator manages the application that is used by Entra Connect Sync to authenticate to Entra, the application permissions and certificate credential used by the application. The administrator [registers a Microsoft Entra app and creates a service principal.](/graph/tutorial-applications-basics?tabs=http#register-an-application-with-microsoft-entra-id). The application should be assigned the required [permissions](#microsoft-graph-permissions-for-byoa)
The administrator is responsible for creating the certificate, rotation, and deletion of unused/expired certificates. The certificate must be stored in the Local Machine store. The administrator is responsible for securing the private key of the certificate and ensuring only Microsoft Azure AD Sync service can access the private key for signing
## Bring Your Own Certificate (BYOC)
>
> Following up on our earlier [Whatโs New](../../../fundamentals/whats-new.md#general-availability---download-microsoft-entra-connect-sync-on-the-microsoft-entra-admin-center) communication, new versions of Microsoft Entra Connect Sync are only available on theโฏ[Microsoft Entra Connect blade](https://entra.microsoft.com/#view/Microsoft_AAD_Connect_Provisioning/AADConnectMenuBlade/%7E/GetStarted) within Microsoft Entra Admin Center and will no longer be released to the [Microsoft Download Center](https://www.microsoft.com/en-us/download/details.aspx?id=47594).
- [Microsoft Entra Connect](https://www.microsoft.com/download/details.aspx?id=47594) version [2.5.2.0](reference-connect-version-history.md) or greater.
- Microsoft Entra account with at least a [Hybrid Identity Administrator](../../role-based-access-control/permissions-reference.md#hybrid-identity-administrator) role.
- On-premises Active Directory Domain Services environment with Windows Server 2016 operating system or later.