VPN auto-triggered profile options
- Windows 10
- Windows 10 Mobile
In Windows 10, a number of features were added to auto-trigger VPN so users won’t have to manually connect when VPN is needed to access necessary resources. There are three different types of auto-trigger rules:
- App trigger
- Name-based trigger
- Always On
VPN profiles in Windows 10 can be configured to connect automatically on the launch of a specified set of applications. You can configure desktop or Universal Windows Platform (UWP) apps to trigger a VPN connection. You can also configure per-app VPN and specify traffic rules for each app. See Traffic filters for more details.
The app identifier for a desktop app is a file path. The app identifier for a UWP app is a package family name.
You can configure a domain name-based rule so that a specific domain name triggers the VPN connection.
Name-based auto-trigger can be configured using the VPNv2/ProfileName/DomainNameInformationList/dniRowId/AutoTrigger setting in the VPNv2 Configuration Service Provider (CSP).
There are four types of name-based triggers:
- Short name: for example, if HRweb is configured as a trigger and the stack sees a DNS resolution request for HRweb, the VPN will be triggered.
- Fully-qualified domain name (FQDN): for example, if HRweb.corp.contoso.com is configured as a trigger and the stack sees a DNS resolution request for HRweb.corp.contoso.com, the VPN will be triggered.
- Suffix: for example, if .corp.contoso.com is configured as a trigger and the stack sees a DNS resolution request with a matching suffix (such as HRweb.corp.contoso.com), the VPN will be triggered. For any short name resolution, VPN will be triggered and the DNS server will be queried for the ShortName.corp.contoso.com.
- All: if used, all DNS resolution should trigger VPN.
Always On is a feature in Windows 10 which enables the active VPN profile to connect automatically on the following triggers:
- User sign-in
- Network change
- Device screen on
When the trigger occurs, VPN tries to connect. If an error occurs or any user input is needed, the user is shown a toast notification for additional interaction.
When a device has multiple profiles with Always On triggers, the user can specify the active profile in Settings > Network & Internet > VPN > VPN profile by selecting the Let apps automatically use this VPN connection checkbox. By default, the first MDM-configured profile is marked as Active. Devices with multiple users have the same restriction: only one profile and therefore only one user will be able to use the Always On triggers.
Preserving user Always On preference
Windows has a feature to preserve a user’s AlwaysOn preference. In the event that a user manually unchecks the “Connect automatically” checkbox, Windows will remember this user preference for this profile name by adding the profile name to the value AutoTriggerDisabledProfilesList.
Should a management tool remove/add the same profile name back and set AlwaysOn to true, Windows will not check the box if the profile name exists in the below registry value in order to preserve user preference. Key: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\Config Value: AutoTriggerDisabledProfilesList Type: REG_MULTI_SZ
Trusted network detection
This feature configures the VPN such that it would not get triggered if a user is on a trusted corporate network. The value of this setting is a list of DNS suffices. The VPN stack will look at the DNS suffix on the physical interface and if it matches any in the configured list and the network is private or provisioned by MDM, then VPN will not get triggered.
Trusted network detection can be configured using the VPNv2/ProfileName/TrustedNetworkDetection setting in the VPNv2 CSP.
Configure app-triggered VPN
The following image shows associating an app to a VPN connection in a VPN Profile configuration policy using Microsoft Intune.
After you add an associated app, if you select the Only these apps can use this VPN connection (per-app VPN) checkbox, the app becomes available in Corporate Boundaries, where you can configure rules for the app. See Traffic filters for more details.