Certain VPNs cause MAUI to respond with connectivity of NetworkAccess.Local

[joshbartley]

Description

When building a Windows MAUI app, the NetworkAccess will sometimes return Local for laptop connected via Wifi with Tailscale installed and the Tailscale interface shows up before the wifi Interface in the Control Panel Network Connections screen. I think that the logic may be picking the first connection when you may have more than one connection which is unexpected as Windows itself reports you have internet access but the app thinks you don't.

Steps to Reproduce

It might take a bit of trial and error to reproduce. I was able to disable Tailscale which then returned NetworkAccess.Internet to the app. Now the Tailscale interface is 4th in the list.

Link to public reproduction project repository

No response

Version with bug

8.0.7 SR2

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Windows

Affected platform versions

Windows SDK

Did you find any workaround?

Disabling the VPN interface helps.

Relevant log output

?Windows.Networking.Connectivity.NetworkInformation.GetInternetConnectionProfile()
{Windows.Networking.Connectivity.ConnectionProfile}
    CanDelete: false
    IsWlanConnectionProfile: false
    IsWwanConnectionProfile: false
    NetworkAdapter: {Windows.Networking.Connectivity.NetworkAdapter}
    NetworkSecuritySettings: {Windows.Networking.Connectivity.NetworkSecuritySettings}
    ProfileName: "Tailscale"
    ServiceProviderGuid: null
    WlanConnectionProfileDetails: null
    WwanConnectionProfileDetails: null

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Closed similar issues:

• Maui Connectivity Change from Online to Offline to Online Connectivity.NetworkAccess == Unknown on Windows 10 (#15803), similarity score: 0.77
• Windows: Connectivity check sometimes return NetworkAccess.Unknown (#17270), similarity score: 0.72

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[QianaJiao]

Verified this issue with Visual Studio 17.10 Preview 7.0 (8.0.21). Can repro it.

I just try to reproduce the issue with another repro https://github.com/breenbob/MauiWindowsConnectivityIssue, and I got the below result:

• When a VPN is connected, the value is NetworkAccess.Local
• When the VPN is not connected, the value is NetworkAccess.Internet

If you have other comments, please provide your repro demo App, I could re-verify.

[drasticactions]

https://github.com/dotnet/maui/blob/ea5ca41a763b3177eb5e686a555fef1958198f14/src/Essentials/src/Connectivity/Connectivity.uwp.cs#L20-L73

This codeblock was changed recently so https://github.com/dotnet/maui/pull/22013 could fix your issue, since it should call the correct path to get the network value. If you run the underlying code for profile.GetNetworkConnectivityLevel

var profile = NetworkInformation.GetInternetConnectionProfile();
					if (profile == null)
						return NetworkAccess.Unknown;

					var level = profile.GetNetworkConnectivityLevel();
					return level switch
					{
						NetworkConnectivityLevel.LocalAccess => NetworkAccess.Local,
						NetworkConnectivityLevel.InternetAccess => NetworkAccess.Internet,
						NetworkConnectivityLevel.ConstrainedInternetAccess => NetworkAccess.ConstrainedInternet,
						_ => NetworkAccess.None,
					};

What value do you get?

[joshbartley]

Running on windows 11 through the Immediate Window

?Windows.Networking.Connectivity.NetworkInformation.GetInternetConnectionProfile().GetNetworkConnectivityLevel()
InternetAccess
?Connectivity.Current.NetworkAccess
Local

The Windows.Networking.Connectivity.NetworkInformation.GetInternetConnectionProfile() gets the correct value and my Windows 11 machine passes the new IsWindowsVersionAtLeast check. It does look like this check will pass though I have no idea if a Windows 10 machine would.