# Azure Stack

> An Azure Stack resource handler connects Cloud Management Platform (CMP) to an Azure Stack endpoint

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Site [llms.txt](/llms.txt)

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Azure Stack is a legacy technology and does not appear in the technology picker. You cannot create a new Azure Stack resource handler. Existing handlers continue to work, and you can still edit their credentials and settings.
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## Credentials for an existing handler

To review or update the connection, open the handler from **Admin** > **Resource Handlers** and select **Edit Credentials**.

| Field | Description |
| --- | --- |
| **Subscription ID** | The ID of the subscription this handler manages. |
| **Application ID** | The ID of the Active Directory application the handler authenticates as. Azure calls this the Client ID. |
| **Authentication Key** | The private key created for that application. Azure displays the value only once, when it is generated. If the password vault feature is enabled, this field offers **Locally Stored** or **Vault Managed**. Select **Vault Managed** to read the key from a configured vault provider. |
| **Directory ID** | The directory the application belongs to. Azure calls this the Tenant ID. |
| **Auth Type** | How the handler authenticates: **Service Principal** or **Active Directory**. Service Principal is the default. |
| **Metadata Endpoint** | The Azure Stack endpoint the handler connects to. This field is what distinguishes an Azure Stack handler from an Azure one. |

## Related

- [Azure](/docs/cmp/configure/infrastructure/resource-handlers/azure/): the current handler for new connections to Azure subscriptions.
- [Azure Local](/docs/cmp/configure/infrastructure/resource-handlers/azure-local/): run Azure services on hardware in your own data center.
- [Use password vaults](/docs/cmp/configure/access-and-security/security/use-password-vaults/): storing the authentication key in HashiCorp Vault, CyberArk, Keeper, AWS Secrets Manager, or Azure Key Vault.
- [Legacy technologies](/docs/cmp/configure/infrastructure/resource-handlers/#legacy-technologies): QEMU-KVM and XenServer, which are also closed to new handlers.