Recently I wrote about PowerON Platforms’ Always On VPN Dynamic Profile Configurator (DPC). This software solution enables administrators to natively provision and manage Always On VPN client configuration settings using Active Directory and group policy. In that post, I provided some high-level details about the product, along with a brief overview of its advanced features.
Demonstration Video
I have recorded a video demonstrating how to install and configure Always On VPN DPC and use its basic features. You will find that demonstration video here.
Advanced Features
Soon I will share more details about Always On VPN DPC and using its advanced capabilities to solve some common challenges faced by Always On VPN administrators. Stay tuned!
Learn More
Are you interested in learning more about PowerON Platforms Always On VPN DPC? Fill out the form below, and I’ll contact you with more information. In addition, you can visit aovpndpc.com to register for an evaluation license.
Deploying user or device authentication certificates to support Always On VPN requires installing the Certificate Connector for Microsoft Intune. The same connector can link Intune to on-premises public key infrastructure (PKI) using PKCS or SCEP certificates. The connector can be configured to run in the SYSTEM context or a domain service account.
Configuration Failure
Administrators may encounter the following error message when installing the certificate connector and selecting the option to use a domain service account.
“Configuration failed. Configuring Microsoft Intune Certificate Connector failed. No changes were made to Feature or Proxy settings. Please try again.”
Root Cause
This error occurs because the service account does not have the correct permissions assigned on the server where the connector is being installed. Specifically, the service account must have the Logon as a service right assigned. To do this, open the local group policy editor (gpedit.msc) and perform the following steps.
Expand Computer Configuration > Windows Settings > Security Settings > Local Policies > User Rights Assignment.
Double-click Log on as a service.
Click Add User or Group.
Add the service account.
Click OK.
Once complete, remove the Certificate Connector for Intune and re-run the installation again.
Integrating Microsoft Azure Conditional Access with Windows 10 Always On VPN has several important benefits. The most important is that it allows administrators to improve their security posture by enforcing access polices that can be dynamically applied. For example, requiring multifactor authentication (MFA) for privileged users (e.g., administrators) or sign-ins that appear to be risky, the type of device they are connecting with, the health of the endpoint, and much more.
Authentication Failure
When configuring Always On VPN to support Azure Conditional Access, administrators may expeirence a failed authentication during preliminary testing. Specifically, an event ID 20227 from the RasClient source may be encountered with the following error message.
“The user <username> dialed a connection named <connection name> which has failed. The error code returned on failure is 812.”
Looking at the event logs on the Network Policy Server (NPS) server reveals an event ID 6273 from the Microsoft Windows security auditing source with Reason Code 258 and the following Reason.
“The revocation function was unable to check revocation for the certificate.”
Root Cause
When Azure Conditional Access is configured for Always On VPN, a short-lived certificate (1 hour lifetime) is provisioned by Azure. This certificate does not include revocation information because, by design, a short-lived certificate does not need to be revoked. However, by default NPS always checks revocation when client authentication certificates are used for authentication. Since the certificate does not include this information, certificate revocation fails.
Resolution
The way to resolve this issue is to disable certificate revocation checking for Protected Extensible Authentication Protocol (PEAP) authentication requests. To do this, open an elevated PowerShell window on the NPS server and run the following command.
