All posts tagged XML

Always On VPN Disconnects in Windows 11

Always On VPN administrators migrating their endpoints to Windows 11 may encounter a scenario where Always On VPN randomly disconnects when the VPN profile is deployed using Microsoft Intune. The same configuration deployed to Windows 10 devices works reliably, however. In addition, Always On VPN profiles deployed using PowerShell (natively or with SCCM) or PowerON DPC do not experience this problem.

Troubleshooting

Administrators troubleshooting this issue will find the root cause is associated with the Always On VPN profiles being removed and replaced each time the device syncs with Intune. This occurs even if there are no changes to the configuration. Removing and replacing the Always On VPN profiles on each device sync is unnecessary, of course, but is also highly disruptive to connected users.

Intune and XML

The Intune team identified the issue, and a fix was made available in the August update. However, many of you have reported the issue persists with some Windows 11 clients after installing the latest updates. Further investigation indicates that although the issue has been resolved when using Intune and the native VPN device configuration profile template, the problem still occurs when using the Custom device configuration template.

Workaround

Microsoft is aware of the issues with deploying Always On VPN client configuration settings using XML in Intune, but there’s no indication when or if they will fix it. Until then, administrators have two options to address this problem.

Native VPN Template

When deploying Always On VPN client configuration settings to Windows 11 endpoints, use the native VPN device configuration template, as shown here.

Using the native VPN template does have some limitations, however. The following settings are not exposed using the native VPN template and can only be configured using XML.

XML

If you must use XML, I’ve had some success by ensuring the order of XML settings is exactly as Intune expects. Follow the steps below to confirm the XML settings order in your XML configuration file.

  1. Deploy your XML file with Intune.
  2. Run Get-VpnClientProfileXML.ps1 to extract the deployed XML settings.
  3. Compare the order of settings to your existing XML.
  4. Make changes to ensure all settings in your XML are in the same order as the extracted XML.
  5. Publish a new XML configuration file using Intune and test.

I’ll caution you that this workaround doesn’t always work reliably. Some customers report that this solved their problems entirely, while others have indicated it does not. My testing shows the same results. Let us know in the comments below if this works for you!

Additional Information

Always On VPN Windows 11 Issues with Intune

Always On VPN PowerShell Script Issues in Windows 11

4 Comments
by Richard M. Hicks on October 9, 2023  •  Permalink
Posted in Always On VPN, AOVPN, AovpnDPC, Application Filter, Azure AD Join, Azure VPN, Deployment, Device Management, device tunnel, DPC, Dynamic Profile Configurator, Endpoint Manager, Enterprise, enterprise mobility, InTune, MDM, MEM, MEMCM, Microsoft, Microsoft Endpoint Manager, Microsoft Intune, Mobility, OMA-DM, OMA-URI, Operational Support, PowerShell, ProfileXML, Remote Access, SCCM, System Center Configuration Manager, systems management, Traffic Filter, Update, user tunnel, VPN, Windows 11
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Posted by Richard M. Hicks on October 9, 2023

https://directaccess.richardhicks.com/2023/10/09/always-on-vpn-disconnects-in-windows-11/

Always On VPN Trusted Network Detection and Native Azure AD Join

Administrators deploying Microsoft Always On VPN are quickly learning that the native Azure Active Directory join (AADJ) model has significant advantages over the more traditional Hybrid Azure AD join (HAADJ) scenario. Native AADJ is much simpler to deploy and manage than HAADJ while still allowing full single sign-on (SSO) to on-premises resources for remote users. Intune even allows for the import of custom ADMX and ADML administrative templates, further reducing the dependency on on-premises Active Directory for device management.

Remote Management

Although devices aren’t joined to the domain, administrators may still wish to access those clients connected to their network for device discovery or to perform administrative tasks. However, when native AADJ clients connect via Always On VPN, the Public Windows firewall profile is assigned to the VPN tunnel adapter. The Public profile is, of course, more restrictive and blocks most management protocols by default.

Firewall Rules

While adding firewall rules to the Public profile to allow management protocols is possible, this isn’t recommended for security reasons. The Public profile is typically loaded when the device is on an untrusted network. Exposing management protocols on an insecure network is asking for trouble.

Domain Profile

Domain-joined or Hybrid AADJ endpoints will use the Domain Windows firewall profile. This profile is more permissive, allowing many standard management protocols by default. Also, administrators can add rules to allow additional access as required without increasing the risk for devices on untrusted networks.

Trusted Network Detection

So, the trick is to get a native AADJ endpoint to load the Domain profile for the VPN tunnel adapter when connected via Always On VPN. Trusted Network Detection is accomplished by using settings configured on the endpoint using the NetworkListManager Configuration Service Provider (CSP).

Intune and XML

There are two settings administrators can enable AADJ devices to detect a trusted network and load the Domain Windows firewall profile. Unfortunately, these settings can only be applied using Intune and the Custom XML template. Administrators will use the following OMA-URI settings.

AllowedTlsAuthenticationEndpoints

The AllowedTlsAuthenticationEndpoints policy setting defines the URL the device uses to validate a trusted network. The target must be an on-premises web server with a valid TLS certificate using HTTPS. The target must be a highly available internal resource inaccessible from the Internet. DirectAccess administrators will be quite familiar with this concept; it’s the Network Location Server (NLS)!

Use the following OMA-URI to configure the TLS authentication endpoint.

URI: ./Device/Vendor/MSFT/Policy/Config/
NetworkListManager/AllowedTlsAuthenticationEndpoints

String: <![CDATA[https://nls.corp.example.net]]>

ConfiguredTlsAuthenticationNetworkName

The ConfiguredTlsAuthenticationNetworkName policy setting is optional. Administrators can use this setting to provide a friendly name for the authenticated trusted network. The FQDN of the target resource (NLS) is used by default. However, using this setting overrides the default with something more meaningful.

Use the following OMA-URI to configure the TLS authentication network name.

URI: ./Device/Vendor/MSFT/Policy/Config/
NetworkListManager/ConfiguredTlsAuthenticationNetworkName

String: <Friendly network name>

Results

Once configured, you’ll find the Always On VPN tunnel adapter uses the Domain Windows firewall profile and an optional friendly network name.

Additional Information

Deploying Always On VPN with Intune using Custom XML and CSP

Always On VPN CSP Updates

Always On VPN and VpnStrategy with CSP

2 Comments
by Richard M. Hicks on June 26, 2023  •  Permalink
Posted in AADJ, Active Directory, administration, Always On VPN, AOVPN, authentication, Azure Active Directory, Azure AD, Azure AD Join, certificates, Deployment, Device Management, Endpoint Manager, Enterprise, enterprise mobility, Group Policy, HAADJ, Hybrid Azure AD Join, Manage Out, MDM, MEM, MEMCM, Microsoft, Microsoft Endpoint Manager, Microsoft Intune, Mobile Device Management, Mobility, OMA-DM, OMA-URI, Operational Support, Remote Access, Security, SSL, SSL and TLS, systems management, TLS, TND, Trusted Network Detection, VPN, Windows 10, Windows 11
Tagged , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , ,

Posted by Richard M. Hicks on June 26, 2023

https://directaccess.richardhicks.com/2023/06/26/always-on-vpn-trusted-network-detection-and-native-azure-ad-join/

Always On VPN and VpnStrategy

NetMotion Mobility for DirectAccess Administrators – Split vs. Force Tunneling

Always On VPN supports a variety of VPN protocols for the user tunnel. Internet Key Exchange version 2 (IKEv2) and Secure Socket Tunneling Protocol (SSTP) are the most common. I wrote about the advantages and disadvantages of each in this post. To summarize, IKEv2 provides the highest security options but suffers from operational limitations. SSTP offers excellent security and is generally more reliable.

VpnStrategy

Always On VPN administrators must choose between IKEv2 and SSTP when configuring the Always On VPN user tunnel. Some administrators may prefer to use IKEv2 when available but then fall back to SSTP if it is not. To accomplish this requires editing the rasphone.pbk file and setting the value of VpnStrategy to 8, as described here.

Challenges

Unfortunately, setting the VpnStrategy value to 8 poses some challenges. Updating rasphone.pbk requires editing a text file on each endpoint post-deployment. Updating rasphone.pbk can be automated using the Update-Rasphone.ps1 script or Microsoft Intune proactive remediation.

Limitations

By default, Windows will overwrite the VpnStrategy setting in rasphone.pbk when fallback occurs. For example, setting VpnStrategy to prefer IKEv2 over SSTP will be reset to use SSTP first if a connection with IKEv2 fails. There’s a registry setting available that’s supposed to prevent this, but it doesn’t always work as expected.

Windows 11

There’s good news for administrators deploying Always On VPN on Windows 11. Microsoft recently introduced support for additional NativeProtocol types in XML. Specifically, VPN protocol preference can now be defined using the ProtocolList native protocol type. When using the ProtocolList native protocol type, each supported VPN protocol is listed in order of preference using the syntax shown below.

In addition, the RetryTimeInHours value defines the time Windows will try the last successful connection protocol. Setting this value to 0 overrides this and ensures the preferred protocol (the first protocol in the list) will always be attempted first.

SSTP Only

Previously the VPNv2CSP only supported IKEv2 or Automatic as values for the native protocol type. Windows 11 now supports SSTP as a native protocol type. Administrators configuring Always On VPN user tunnel connections using SSTP exclusively can now use this option.

Caveats

While the settings above are supported in both Windows 11 21H2 and 22H2, there are some known issues when enabling these settings. Specifically, when administrators define the ProtocolList value for the native protocol type, IKEv2 is always shown as the active protocol, even when an SSTP connection is established.

Also, if ProtocolList is used, the VPN connection cannot be managed using PowerShell. The VPN profile will not be displayed when running Get-VpnConnection at the time of this writing. Hopefully Microsoft will fix this soon.

Additional Information

Always On VPN CSP Updates

Always On VPN IKEv2 and SSTP Fallback

Always On VPN and Intune Proactive Remediation

Always On VPN Protocol Recommendations for Windows Server RRAS

Always On VPN IKEv2 Features and Limitations

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by Richard M. Hicks on May 22, 2023  •  Permalink
Posted in administration, Always On VPN, AOVPN, Azure VPN, Deployment, Device Management, Enterprise, enterprise mobility, IKEv2, InTune, MDM, MEM, Microsoft, Microsoft Endpoint Manager, Microsoft Intune, Mobile Device Management, Mobility, Operational Support, PowerShell, Remote Access, Secure Socket Tunneling Protocol, Security, SSTP, systems management, user tunnel, VPN, Windows 11
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Posted by Richard M. Hicks on May 22, 2023

https://directaccess.richardhicks.com/2023/05/22/always-on-vpn-and-vpnstrategy/

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