.Net Core warning No XML encryptor configured

Question

When I start my service (API on .Net Core 2.2 in Docker container) I've got a warning:

No XML encryptor configured. Key {daa53741-8295-4c9b-ae9c-e69b003f16fa} may be persisted to storage in unencrypted form.

I didn't configure DataProtection. I've found solutions to configure DataProtection but I don't need to save this key. For me if the key will only be persisted until the application restarts - it's Ok. But I don't need to see this warning in logs

Any ideas? How can we do it?

My startup Class looks like there:

public class Startup {
  public Startup(IConfiguration configuration) {
    Configuration = configuration;
  }

  public IConfiguration Configuration { get; }

  public void ConfigureServices(IServiceCollection services) {
    services.AddMemoryCache();
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
    services.AddApiVersioning(o => o.ApiVersionReader = new HeaderApiVersionReader("api-version"));
  }

  public void Configure(IApplicationBuilder app, IHostingEnvironment env, IApplicationLifetime lifetime) {
    if (env.IsDevelopment()) {
      app.UseDeveloperExceptionPage();
    }

    app.UseMvc();

    lifetime.ApplicationStarted.Register(OnApplicationStarted);
    lifetime.ApplicationStopping.Register(OnShutdown);
  }

  public void OnApplicationStarted() {
    Console.Out.WriteLine($"Open Api Started");
  }

  public void OnShutdown() {
    Console.Out.WriteLine($"Open Api is shutting down.");
  }
}

Maybe it's help too my packages in the project

<ItemGroup>
    <PackageReference Include="BouncyCastle.NetCore" Version="1.8.5" />
    <PackageReference Include="Microsoft.AspNetCore.App" />
    <PackageReference Include="Microsoft.AspNetCore.Mvc.Versioning" Version="3.1.2" />
    <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.2.0" PrivateAssets="All" />
    <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.5.4" />
    <PackageReference Include="Oracle.ManagedDataAccess.Core" Version="2.18.6" />
</ItemGroup>

Answer 1

It maybe permission error but you have to sure about. Try to log when thrown this error i see many reason to having this error on the development environment, generally file read permission or couldn't find or no file.

Wrap your main function with bellow logging algorithm and see whats wrong

public static void Main(string[] args)
        {
            CurrentDirectoryHelpers.SetCurrentDirectory();

            Log.Logger = new LoggerConfiguration()
                            .MinimumLevel.Information()
                            .MinimumLevel.Override("Serilog", LogEventLevel.Information)
                            .WriteTo.File("Logs/LogFrom_ProgramMain.txt")
                            .CreateLogger();

            try
            {
                var whb = WebHost.CreateDefaultBuilder(args).UseContentRoot(Directory.GetCurrentDirectory());

               //whb... your codes

                Log.Logger.Information("Information:blabla");

            }
            catch(Exception ex)
            {
                Log.Logger.Error("Main handled an exception: " + ex.Message);
            }
        }

dont palter trust the code, and see

You can use this helper method if you need

internal class CurrentDirectoryHelpers
    {
        internal const string AspNetCoreModuleDll = "aspnetcorev2_inprocess.dll";

        [System.Runtime.InteropServices.DllImport("kernel32.dll")]
        private static extern IntPtr GetModuleHandle(string lpModuleName);

        [System.Runtime.InteropServices.DllImport(AspNetCoreModuleDll)]
        private static extern int http_get_application_properties(ref IISConfigurationData iiConfigData);

        [System.Runtime.InteropServices.StructLayout(System.Runtime.InteropServices.LayoutKind.Sequential)]
        private struct IISConfigurationData
        {
            public IntPtr pNativeApplication;
            [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.BStr)]
            public string pwzFullApplicationPath;
            [System.Runtime.InteropServices.MarshalAs(System.Runtime.InteropServices.UnmanagedType.BStr)]
            public string pwzVirtualApplicationPath;
            public bool fWindowsAuthEnabled;
            public bool fBasicAuthEnabled;
            public bool fAnonymousAuthEnable;
        }

        public static void SetCurrentDirectory()
        {
            try
            {
                // Check if physical path was provided by ANCM
                var sitePhysicalPath = Environment.GetEnvironmentVariable("ASPNETCORE_IIS_PHYSICAL_PATH");
                if (string.IsNullOrEmpty(sitePhysicalPath))
                {
                    // Skip if not running ANCM InProcess
                    if (GetModuleHandle(AspNetCoreModuleDll) == IntPtr.Zero)
                    {
                        return;
                    }

                    IISConfigurationData configurationData = default(IISConfigurationData);
                    if (http_get_application_properties(ref configurationData) != 0)
                    {
                        return;
                    }

                    sitePhysicalPath = configurationData.pwzFullApplicationPath;
                }

                Environment.CurrentDirectory = sitePhysicalPath;
            }
            catch
            {
                // ignore
            }
        }
    }