Certificates for the cloud management gateway
Applies to: Configuration Manager (current branch)
Depending upon the scenario you use to manage clients on the internet with the cloud management gateway (CMG), you need one or more of the following digital certificates:
For more information about the different scenarios, see plan for cloud management gateway.
Certificates for the cloud management gateway support the following configurations:
2048-bit or 4096-bit key length
Key storage providers for certificate private keys. For more information, see CNG certificates overview.
When you configure Windows with the following policy: System cryptography: Use FIPS-compliant algorithms for encryption, hashing, and signing
TLS 1.2. For more information, see How to enable TLS 1.2.
CMG server authentication certificate
This certificate is required in all scenarios.
You supply this certificate when creating the CMG in the Configuration Manager console.
The CMG creates an HTTPS service to which internet-based clients connect. The server requires a server authentication certificate to build the secure channel. Acquire a certificate for this purpose from a public provider, or issue it from your public key infrastructure (PKI). For more information, see CMG trusted root certificate to clients.
The CMG server authentication certificate supports wildcards. Some certificate authorities issue certificates using a wildcard character for the hostname. For example,
*.contoso.com. Some organizations use wildcard certificates to simplify their PKI and reduce maintenance costs.
For more information on how to use a wildcard certificate with a CMG, see Set up a CMG.
This certificate requires a globally unique name to identify the service in Azure. Before requesting a certificate, confirm that the Azure domain name you want is unique. For example, GraniteFalls.CloudApp.Net.
Sign in to the Azure portal.
Select All resources, and then select Add.
Search for Cloud service. Select Create.
In the DNS name field, type the prefix you want, for example GraniteFalls. The interface reflects whether the domain name is available or already in use by another service.
Don't create the service in the portal, just use this process to check the name availability.
If you also enable the CMG for content, confirm that the CMG service name is also a unique Azure storage account name. If the CMG cloud service name is unique, but the storage account name isn't, Configuration Manager fails to provision the service in Azure. Repeat the above process in the Azure portal with the following changes:
- Search for Storage account
- Test your name in the Storage account name field
The DNS name prefix, for example GraniteFalls, should be 3 to 24 characters long, and only use alphanumeric characters. Don't use special characters, like a dash (
CMG trusted root certificate to clients
Clients must trust the CMG server authentication certificate. There are two methods to accomplish this trust:
Use a certificate from a public and globally trusted certificate provider. For example, but not limited to, DigiCert, Thawte, or VeriSign. Windows clients include trusted root certificate authorities (CAs) from these providers. By using a server authentication certificate issued by one of these providers, your clients automatically trust it.
Use a certificate issued by an enterprise CA from your public key infrastructure (PKI). Most enterprise PKI implementations add the trusted root CAs to Windows clients. For example, using Active Directory Certificate Services with group policy. If you issue the CMG server authentication certificate from a CA that your clients don't automatically trust, add the CA trusted root certificate to internet-based clients.
You can also use Configuration Manager certificate profiles to provision certificates on clients. For more information, see Introduction to certificate profiles.
If you plan to install the Configuration Manager client from Intune, you can also use Intune certificate profiles to provision certificates on clients. For more information, see Configure a certificate profile.
Server authentication certificate issued by public provider
A third-party certificate provider can't create a certificate for CloudApp.net, as that domain is owned by Microsoft. You can only get a certificate issued for a domain you own. The main reason for acquiring a certificate from a third-party provider is that your clients already trust that provider's root certificate.
Use the following process to create a DNS alias:
Create a canonical name record (CNAME) in your organization's public DNS. This record creates an alias for the CMG to a friendly name that you use in the public certificate.
For example, Contoso names their CMG GraniteFalls. This name becomes GraniteFalls.CloudApp.Net in Azure. In Contoso's public DNS contoso.com namespace, the DNS administrator creates a new CNAME record for GraniteFalls.Contoso.com for the real host name, GraniteFalls.CloudApp.net.
Request a server authentication certificate from a public provider using the Common Name (CN) of the CNAME alias. For example, Contoso uses GraniteFalls.Contoso.com for the certificate CN.
Create the CMG in the Configuration Manager console using this certificate. On the Settings page of the Create Cloud Management Gateway Wizard:
When you add the server certificate for this cloud service (from Certificate file), the wizard extracts the hostname from the certificate CN as the service name.
It then appends that hostname to cloudapp.net, or usgovcloudapp.net for the Azure US Government cloud, as the Service FQDN to create the service in Azure.
For example, when Contoso creates the CMG, Configuration Manager extracts the hostname GraniteFalls from the certificate CN. Azure creates the actual service as GraniteFalls.CloudApp.net.
When you create the CMG instance in Configuration Manager, while the certificate has GraniteFalls.Contoso.com, Configuration Manager only extracts the hostname, for example: GraniteFalls. It appends this hostname to CloudApp.net, which Azure requires when creating a cloud service. The CNAME alias in the DNS namespace for your domain, Contoso.com, maps together these two FQDNs. Configuration Manager gives clients a policy to access this CMG, the DNS mapping ties it together so that they can securely access the service in Azure.
Server authentication certificate issued from enterprise PKI
Create a custom SSL certificate for the CMG the same as for a cloud distribution point. Follow the instructions for Deploying the service certificate for cloud-based distribution points but do the following things differently:
When requesting the custom web server certificate, provide an FQDN for the certificate's common name. This name can be a public domain name you own or you may use the cloudapp.net domain. If using your own public domain, refer to the process above for creating a DNS alias in your organization's public DNS.
When using the cloudapp.net public domain for the CMG web server certificate:
On the Azure public cloud, use a name that ends in cloudapp.net
Use a name that ends in usgovcloudapp.net for the Azure US Government cloud
Client authentication certificate
Client authentication certificate requirements:
- This certificate is required for internet-based clients running Windows 8.1, and Windows 10 devices not joined to Azure Active Directory (Azure AD).
- It may be required on the CMG connection point. For more information, see CMG connection point.
- It isn't required for Windows 10 clients joined to Azure AD.
- If your site is version 2002 or later, devices can use a token issued by the site. For more information, see Token-based authentication for CMG.
The clients use this certificate to authenticate with the CMG. Windows 10 devices that are hybrid or cloud domain-joined don't require this certificate because they use Azure AD to authenticate.
Provision this certificate outside of the context of Configuration Manager. For example, use Active Directory Certificate Services and group policy to issue client authentication certificates. For more information, see Deploying the client certificate for Windows computers.
Microsoft recommends joining devices to Azure AD. Internet-based devices can use Azure AD to authenticate with Configuration Manager. It also enables both device and user scenarios whether the device is on the internet or connected to the internal network. For more information, see Install and register the client using Azure AD identity.
Starting in version 2002, Configuration Manager extends its support for internet-based devices that don't often connect to the internal network, aren't able to join Azure AD, and don't have a method to install a PKI-issued certificate. For more information, see Token-based authentication for CMG.
CMG connection point
To securely forward client requests, the CMG connection point requires a secure connection with the management point. Depending upon how you configure your devices and management points determines the CMG connection point configuration.
The management point is HTTPS
Clients have a client authentication certificate: The CMG connection point requires a client authentication certificate that corresponds to the server authentication certificate on the HTTPS management point.
Clients use Azure AD authentication or a Configuration Manager token: This certificate isn't required.
If you configure the management point for Enhanced HTTP: This certificate isn't required.
For more information, see Enable management point for HTTPS.
Client trusted root certificate to CMG
This certificate is required when using client authentication certificates. When all clients use Azure AD for authentication, this certificate isn't required.
You supply this certificate when creating the CMG in the Configuration Manager console.
The CMG must trust the client authentication certificates. To accomplish this trust, provide the trusted root certificate chain. Make sure to add all certificates in the trust chain. For example, if the client authentication certificate is issued by an intermediate CA, add both the intermediate and root CA certificates.
When you create a CMG, you're no longer required to provide a trusted root certificate on the Settings page. This certificate isn't required when using Azure AD for client authentication, but used to be required in the wizard. If you're using PKI client authentication certificates, then you still must add a trusted root certificate to the CMG.
In version 1902 and earlier, you can only add two trusted root CAs and four intermediate (subordinate) CAs.
Export the client certificate's trusted root
After issuing a client authentication certificate to a computer, use this process on that computer to export the trusted root.
Open the Start menu. Type "run" to open the Run window. Open
From the File menu, choose Add/Remove Snap-in....
In the Add or Remove Snap-ins dialog box, select Certificates, then select Add.
In the Certificates snap-in dialog box, select Computer account, then select Next.
In the Select Computer dialog box, select Local computer, then select Finish.
In the Add or Remove Snap-ins dialog box, select OK.
Expand Certificates, expand Personal, and select Certificates.
Select a certificate whose Intended Purpose is Client Authentication.
From the Action menu, select Open.
Go to the Certification Path tab.
Select the next certificate up the chain, and select View Certificate.
On this new Certificate dialog box, go to the Details tab. Select Copy to File....
Complete the Certificate Export Wizard using the default certificate format, DER encoded binary X.509 (.CER). Make note of the name and location of the exported certificate.
Export all of the certificates in the certification path of the original client authentication certificate. Make note of which exported certificates are intermediate CAs, and which ones are trusted root CAs.
Enable management point for HTTPS
Provision this certificate outside of the context of Configuration Manager. For example, use Active Directory Certificate Services and group policy to issue a web server certificate. For more information, see PKI certificate requirements and Deploy the web server certificate for site systems that run IIS.
When using the site option to Use Configuration Manager-generated certificates for HTTP site systems, the management point can be HTTP. For more information, see Enhanced HTTP.
If you aren't using Enhanced HTTP, and your environment has multiple management points, you don't have to HTTPS-enable them all for CMG. Configure the CMG-enabled management points as Internet only. Then your on-premises clients don't try to use them.
Enhanced HTTP certificate for management points
When you enable Enhanced HTTP, the site server generates a self-signed certificate named SMS Role SSL Certificate, issued by the root SMS Issuing certificate. The management point adds this certificate to the IIS Default Web site bound to port 443.
Management point client connection mode summary
These tables summarize whether the management point requires HTTP or HTTPS, depending upon the type of client and site version.
For internet-based clients communicating with the cloud management gateway
Configure an on-premises management point to allow connections from the CMG with the following client connection mode:
|Type of client||Management point|
|Workgroup||E-HTTPNote 1, HTTPS|
|AD domain-joined||E-HTTPNote 1, HTTPS|
|Azure AD-joined||E-HTTP, HTTPS|
Note 1: This configuration requires the client has a client authentication certificate, and only supports device-centric scenarios.
For on-premises clients communicating with the on-premises management point
Configure an on-premises management point with the following client connection mode:
|Type of client||Management point|
|AD domain-joined||HTTP, HTTPS|
AD domain-joined clients support both device- and user-centric scenarios communicating with an HTTP or HTTPS management point.
Azure AD-joined and hybrid-joined clients can communicate via HTTP for device-centric scenarios, but need E-HTTP or HTTPS to enable user-centric scenarios. Otherwise they behave the same as workgroup clients.
Legend of terms
Workgroup: The device isn't joined to a domain or Azure AD, but has a client authentication certificate.
AD domain-joined: You join the device to an on-premises Active Directory domain.
Azure AD-joined: Also known as cloud domain-joined, you join the device to an Azure AD tenant. For more information, see Azure AD joined devices.
Hybrid-joined: You join the device to your on-premises Active Directory and register it with your Azure AD. For more information, see Hybrid Azure AD joined devices.
HTTP: On the management point properties, you set the client connections to HTTP.
HTTPS: On the management point properties, you set the client connections to HTTPS.
E-HTTP: On the site properties, Communication Security tab, you set the site system settings to HTTPS or HTTP, and you enable the option to Use Configuration Manager-generated certificates for HTTP site systems. You configure the management point for HTTP, the HTTP management point is ready for both HTTP and HTTPS communication (token auth scenarios).
In version 1902 and earlier, this tab is called Client Computer Communication.
Azure management certificate
This certificate is required for classic service deployments. It's not required for Azure Resource Manager deployments.
Starting in version 1810, classic service deployments in Azure are deprecated in Configuration Manager. Start using Azure Resource Manager deployments for the cloud management gateway. For more information, see Plan for CMG.
Starting in Configuration Manager version 1902, Azure Resource Manager is the only deployment mechanism for new instances of the cloud management gateway. This certificate isn't required in Configuration Manager version 1902 or later.
You supply this certificate in the Azure portal, and when creating the CMG in the Configuration Manager console.
To create the CMG in Azure, the Configuration Manager service connection point needs to first authenticate to your Azure subscription. When using a classic service deployment, it uses the Azure management certificate for this authentication. An Azure administrator uploads this certificate to your subscription. When you create the CMG in the Configuration Manager console, provide this certificate.
For more information and instructions for how to upload a management certificate, see the following articles in the Azure documentation:
Make sure to copy the subscription ID associated with the management certificate. You use it for creating the CMG in the Configuration Manager console.