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Logging

The server app is a standard ASP.NET Core app. See the ASP.NET Core logging guidance to enable a lower logging level in the server app.

To enable debug or trace logging for Blazor WebAssembly authentication, see the Client-side authentication logging section of xref:blazor/fundamentals/logging with the article version selector set to ASP.NET Core in .NET 7 or later.

Common errors

  • Debugger breaks on an exception during logout with Microsoft Entra External ID

    The following exception stops the Visual Studio debugger during logout with Microsoft Entra External ID:

    :::no-loc text="Uncaught TypeError TypeError: Failed to execute 'postMessage' on 'Window': The provided value cannot be converted to a sequence.":::

    Visual Studio Debugger breaking on JavaScript exception during logout

    The exception is thrown from Entra JavaScript code, so this isn't a problem with ASP.NET Core. The exception doesn't impact app functionality in production, so the exception can be ignored during local development testing.

  • Misconfiguration of the app or Identity Provider (IP)

    The most common errors are caused by incorrect configuration. The following are a few examples:

    • Depending on the requirements of the scenario, a missing or incorrect Authority, Instance, Tenant ID, Tenant domain, Client ID, or Redirect URI prevents an app from authenticating clients.
    • Incorrect request scopes prevent clients from accessing server web API endpoints.
    • Incorrect or missing server API permissions prevent clients from accessing server web API endpoints.
    • Running the app at a different port than is configured in the Redirect URI of the IP's app registration. Note that a port isn't required for Microsoft Entra ID and an app running at a localhost development testing address, but the app's port configuration and the port where the app is running must match for non-localhost addresses.

    Configuration coverage in this article shows examples of the correct configuration. Carefully check the configuration looking for app and IP misconfiguration.

    If the configuration appears correct:

    • Analyze application logs.

    • Examine the network traffic between the client app and the IP or server app with the browser's developer tools. Often, an exact error message or a message with a clue to what's causing the problem is returned to the client by the IP or server app after making a request. Developer tools guidance is found in the following articles:

    The documentation team responds to document feedback and bugs in articles (open an issue from the This page feedback section) but is unable to provide product support. Several public support forums are available to assist with troubleshooting an app. We recommend the following:

    The preceding forums are not owned or controlled by Microsoft.

    For non-security, non-sensitive, and non-confidential reproducible framework bug reports, open an issue with the ASP.NET Core product unit. Don't open an issue with the product unit until you've thoroughly investigated the cause of a problem and can't resolve it on your own and with the help of the community on a public support forum. The product unit isn't able to troubleshoot individual apps that are broken due to simple misconfiguration or use cases involving third-party services. If a report is sensitive or confidential in nature or describes a potential security flaw in the product that cyberattackers may exploit, see Reporting security issues and bugs (dotnet/aspnetcore GitHub repository).

  • Unauthorized client for ME-ID

    info: Microsoft.AspNetCore.Authorization.DefaultAuthorizationService[2] Authorization failed. These requirements were not met: DenyAnonymousAuthorizationRequirement: Requires an authenticated user.

    Login callback error from ME-ID:

    • Error: unauthorized_client
    • Description: AADB2C90058: The provided application is not configured to allow public clients.

    To resolve the error:

    1. In the Azure portal, access the app's manifest.
    2. Set the allowPublicClient attribute to null or true.

Cookies and site data

Cookies and site data can persist across app updates and interfere with testing and troubleshooting. Clear the following when making app code changes, user account changes with the provider, or provider app configuration changes:

  • User sign-in cookies
  • App cookies
  • Cached and stored site data

One approach to prevent lingering cookies and site data from interfering with testing and troubleshooting is to:

  • Configure a browser
    • Use a browser for testing that you can configure to delete all cookie and site data each time the browser is closed.
    • Make sure that the browser is closed manually or by the IDE for any change to the app, test user, or provider configuration.
  • Use a custom command to open a browser in InPrivate or Incognito mode in Visual Studio:
    • Open Browse With dialog box from Visual Studio's Run button.
    • Select the Add button.
    • Provide the path to your browser in the Program field. The following executable paths are typical installation locations for Windows 10. If your browser is installed in a different location or you aren't using Windows 10, provide the path to the browser's executable.
      • Microsoft Edge: C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
      • Google Chrome: C:\Program Files (x86)\Google\Chrome\Application\chrome.exe
      • Mozilla Firefox: C:\Program Files\Mozilla Firefox\firefox.exe
    • In the Arguments field, provide the command-line option that the browser uses to open in InPrivate or Incognito mode. Some browsers require the URL of the app.
      • Microsoft Edge: Use -inprivate.
      • Google Chrome: Use --incognito --new-window {URL}, where the {URL} placeholder is the URL to open (for example, https://localhost:5001).
      • Mozilla Firefox: Use -private -url {URL}, where the {URL} placeholder is the URL to open (for example, https://localhost:5001).
    • Provide a name in the Friendly name field. For example, Firefox Auth Testing.
    • Select the OK button.
    • To avoid having to select the browser profile for each iteration of testing with an app, set the profile as the default with the Set as Default button.
    • Make sure that the browser is closed by the IDE for any change to the app, test user, or provider configuration.

App upgrades

A functioning app may fail immediately after upgrading either the .NET SDK on the development machine or changing package versions within the app. In some cases, incoherent packages may break an app when performing major upgrades. Most of these issues can be fixed by following these instructions:

  1. Clear the local system's NuGet package caches by executing dotnet nuget locals all --clear from a command shell.
  2. Delete the project's bin and obj folders.
  3. Restore and rebuild the project.
  4. Delete all of the files in the deployment folder on the server prior to redeploying the app.

Note

Use of package versions incompatible with the app's target framework isn't supported. For information on a package, use the NuGet Gallery.

Start the solution from the correct project

Blazor Web Apps:

  • For one of the Backend-for-Frontend (BFF) pattern samples, start the solution from the Aspire/Aspire.AppHost project.
  • For one of the non-BFF pattern samples, start the solution from the server project.

Blazor Server:

Start the solution from the server project.

Inspect the user

The following UserClaims component can be used directly in apps or serve as the basis for further customization.

UserClaims.razor:

@page "/user-claims"
@using System.Security.Claims
@using Microsoft.AspNetCore.Authorization
@attribute [Authorize]

<PageTitle>User Claims</PageTitle>

<h1>User Claims</h1>

@if (claims.Any())
{
    <ul>
        @foreach (var claim in claims)
        {
            <li><b>@claim.Type:</b> @claim.Value</li>
        }
    </ul>
}

@code {
    private IEnumerable<Claim> claims = Enumerable.Empty<Claim>();

    [CascadingParameter]
    private Task<AuthenticationState>? AuthState { get; set; }

    protected override async Task OnInitializedAsync()
    {
        if (AuthState == null)
        {
            return;
        }

        var authState = await AuthState;
        claims = authState.User.Claims;
    }
}

Inspect the access token

Obtaining the access token during development is often helpful when troubleshooting app and Azure configuration problems. In the following example for a weather forecast endpoint, the bearer token and token details are logged when in the DEBUG configuration. You can decode the token using an online JWT token decoder, such as the Microsoft JWT token decoder, or log details from the token in C#, as the following example demonstrates.

Caution

In production, avoid logging the token or its contents.

app.MapGet("/weather-forecast", (HttpContext context, ILogger<Program> logger) =>
{
#if DEBUG
    var authHeader = context.Request.Headers.Authorization.FirstOrDefault(v => 
        v != null && 
        v.StartsWith("Bearer ", StringComparison.OrdinalIgnoreCase));

    if (authHeader is not null)
    {
        var token = authHeader["Bearer ".Length..].Trim();
        logger.LogDebug("Token: {Token}", token);

        try
        {
            var handler = 
                new System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler();
            var jwtToken = handler.ReadJwtToken(token);
            logger.LogDebug("Audience: {Audience}", 
                string.Join(", ", jwtToken.Audiences));
            logger.LogDebug("Issuer: {Issuer}", jwtToken.Issuer);
        }
        catch (Exception ex)
        {
            logger.LogError("Failed to decode token: {Message}", ex.Message);
        }
    }
#endif

    var forecast = Enumerable.Range(1, 5).Select(index =>
        new WeatherForecast
        (
            DateOnly.FromDateTime(DateTime.Now.AddDays(index)),
            Random.Shared.Next(-20, 55),
            summaries[Random.Shared.Next(summaries.Length)]
        ))
        .ToArray();
    return forecast;
}).RequireAuthorization();