[Bug] Interactive auth with Edge system browser sometimes hangs

[bgavrilMS]

Which Version of MSAL are you using ?
MSAL 4.7

Platform
netcore or net classic

What authentication flow has the issue?

• Desktop / Mobile
  • Interactive
  • Integrated Windows Auth
  • Username Password
  • Device code flow (browserless)
• Web App
  • Authorization code
  • OBO
• Web API
  • OBO

Repro

Configure interactive auth to use the system browser and also configure it to use Edge.

  var options = new SystemWebViewOptions()
{
     OpenBrowserAsync = SystemWebViewOptions.OpenWithEdgeBrowserAsync
};

var cts = new CancellationTokenSource();
authTask = pca.AcquireTokenInteractive(s_scopes)
                        .WithSystemWebViewOptions(options)
                        .ExecuteAsync(cts.Token);

Actual behavior
Sometimes the browser hangs at an url similar to:
https://login.microsoftonline.com/common/reprocess?ctx=rQIIAW2Q

Eventually an MsalClientException occurs, stating:

Could not extract the query from the authorization response - check Pii enabled logs for details

This happens about 50% of the time.

Possible Solution
It looks like the TCP listener is invoked, but no data is available. Calling ReadAsync seems to block. After some time or if the browser is refreshed, the tcp listener reads 0 bytes.

[bgavrilMS]

P1 as it is blocking customers (Storage Explorer in particular)

[bgavrilMS]

CC @crmann1

[jmprieur]

@bgavrilMS : we did not ship 4.8 yet? we might just want to mark it as fixed (and keep it open)

[bgavrilMS]

I merged the fix and it looks like GitHub closes the associated issue...

[bgavrilMS]

I think this is because GitHub inspects the PR comments and if it finds smth like "fixes bug xxx" then it automatically closes bug xxx. Smart, but not customizable ... :)

https://help.github.com/en/github/managing-your-work-on-github/closing-issues-using-keywords

[jmprieur]

oh, ok. thanks for the explantion, @bgavrilMS !

[jmprieur]

Released today in MSAL.NET 4.7.1