authentication with Xamarin. Android and Microsoft.Azure.Mobile.Client Microsoft provider error - azure-mobile-services

Question

I had a code that worked unlit few days ago: this is an xamarin.android activity code
[Activity(Label = "AuthSample", MainLauncher = true, Icon = "#drawable/icon")]
public class MainActivity : Activity
{
Button login;
//Mobile Service Client reference
private MobileServiceClient client;
protected override void OnCreate(Bundle bundle)
{
base.OnCreate(bundle);
// Create the Mobile Service Client instance, using the provided
// Mobile Service URL and key
client = new MobileServiceClient("https://XXXXXXX.azurewebsites.net");
// Set our view from the "main" layout resource
SetContentView (Resource.Layout.Main);
login = FindViewById<Button>(Resource.Id.buttonLoginUser);
login.Click += onLoginClick;
}
private async void onLoginClick(object sender, EventArgs e)
{
// Load data only after authentication succeeds.
if (await Authenticate())
{
}
}
// Define a authenticated user.
private MobileServiceUser user;
private async Task<bool> Authenticate()
{
var success = false;
try
{
// Sign in with Microsoft login using a server-managed flow.
user = await client.LoginAsync(this,
MobileServiceAuthenticationProvider.MicrosoftAccount);
CreateAndShowDialog(string.Format("you are now logged in - {0}",
user.UserId), "Logged in!");
success = true;
}
catch (Exception ex)
{
CreateAndShowDialog(ex, "Authentication failed");
}
return success;
}
private void CreateAndShowDialog(Exception exception, String title)
{
CreateAndShowDialog(exception.Message, title);
}
private void CreateAndShowDialog(string message, string title)
{
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.SetMessage(message);
builder.SetTitle(title);
builder.Create().Show();
}
}
i did all the instruction in the tutorial.
the LoginAsync redirect me to the Microsoft login page, i am able to authenticate and after a successful authentication i get this error : "the page cannot be displayed because an internal server error has occured"
i am working with 3.1 azure sdk version

Answer 1

According to your description, I assumed that you could follow the steps below to troubleshoot this issue.
For Node.js backend
You could leverage App Service Editor or kudu for create the iisnode.yml file under root folder (D:\home\site\wwwroot) if not exists. Then add the following settings for enable logging to debug a Node.js web app in azure app service:
loggingEnabled: true
logDirectory: iisnode
Additionally, here is a similar issue about enable node.js logging, you could refer to it. Also, for more details about kudu and app service editor, you could refer to here.
For C# backend
you could edit App_Start\Startup.MobileApp.cs file and configure the IncludeErrorDetailPolicy as follows for capturing the error details:
HttpConfiguration config = new HttpConfiguration();
config.IncludeErrorDetailPolicy = IncludeErrorDetailPolicy.Always;
For a simple way, you could access https://{your-app-name}.azurewebsites.net/.auth/login/{provider-name} via the browser, then check the detailed error message for locating the specific error.
UPDATE:
Based on your address, I checked your app and found I could log with my Microsoft Account via the browser. Then I checked with your table endpoint and found the follow error:
https://{your-app-name}.azurewebsites.net/tables/todoitem?ZUMO-API-VERSION=2.0.0
message: "An error has occurred.",
exceptionMessage: "A network-related or instance-specific error occurred while establishing a connection to SQL Server. The server was not found or was not accessible. Verify that the instance name is correct and that SQL Server is configured to allow remote connections. (provider: SQL Network Interfaces, error: 52 - Unable to locate a Local Database Runtime installation. Verify that SQL Server Express is properly installed and that the Local Database Runtime feature is enabled.)",
exceptionType: "System.Data.SqlClient.SqlException",
As I known, when following the quickstart to create the data store for your backend, downloading the C# backend, then deploy the backend to moible app. At this point, your created connection string via azure portal would not be exposed to your ASP.NET application, and the default connection string would use the localdb, you need to edit the Web.config file before deploying to azure mobile app as follows:
<connectionStrings>
<add name="MS_TableConnectionString" connectionString="Data Source=tcp:{your-sqlserver-name}.database.windows.net,1433;Initial Catalog={db-name};User ID={user-id};Password={password}" providerName="System.Data.SqlClient" />
</connectionStrings>
Or configure the connection string when deploy your app to azure mobile app via VS as follows:

Answer 2

It seems that there was a problem in azure or in Microsoft authentication.
after two days of frustration everything just started to work again!!