Exception "System.Security.Cryptography.CryptographicException" after Publishing project

Question

Everytime I publish my Blazor Server-project to my website domain, and opening the website, this exception occurs, and there's little to no help Googling it:

And it says AppState.cs: line 21, so here's the codeline for it:

This exception is not happening under debugging localhost. When I delete localStorage from the browser on my website, and refreshing, then everything works. But I don't want my customers having this exception and having to tell them to delete the localstorage everytime I'm publishing.

My Program.cs if necessary:

var builder = WebApplication.CreateBuilder(args);

builder.Services.AddRazorPages();
builder.Services.AddServerSideBlazor().AddCircuitOptions(options => options.DetailedErrors = true);
builder.Services.AddHttpClient();

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options =>
    {
        options.TokenValidationParameters.ValidateIssuerSigningKey = true; // Validér secret key for JWT
        options.TokenValidationParameters.ValidateLifetime = false; // Validér ikke Lifetime på JWT
        options.TokenValidationParameters.ValidateAudience = false; // Ikke validér clients(audience), fx BlazorWeb, der skal anvende IdentityServer
        options.TokenValidationParameters.ValidateIssuer = false; // Ikke validér IdentityServer(issuer)
        options.TokenValidationParameters.IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(builder.Configuration["JWT:Secret"])); // Sæt secret key for JWT, der bruges som adgangskode til at tilgå JWT
    });

builder.Services.AddScoped<AuthService>();
builder.Services.AddScoped<AuthenticationStateProvider, AppState>();

var app = builder.Build();

if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
    app.UseHsts();
}

RewriteOptions options = new RewriteOptions();
options.AddRedirectToWww();
options.AddRedirectToHttps();
app.UseRewriter(options);

app.UseStaticFiles();
app.UseRouting();

app.UseAuthentication();
app.UseAuthorization();

app.MapBlazorHub();
app.MapFallbackToPage("/_Host");

app.Run();

Answer 1

After many hours of research, I managed to fix it. I did the following; Added builder.Services.AddDataProtection().PersistKeysToFileSystem(new DirectoryInfo(@"c:\your\path\to\store\keys"));.

Answer 2

Try to set Load User Profile to true in your IIS app pool in the advanced settings. see this answer, I hope that will help you!