How to fix 500.30 - ASP.NET CORE app failed to start

Question

Well after publishing the program on IIS, we have this error

HTTP Error 500.30 - ASP.NET Core app failed to start
Common solutions to this issue:
The app failed to start
The app started but then stopped
The app started but threw an exception during startup
Troubleshooting steps:
Check the system event log for error messages
Enable logging the application process' stdout messages
Attach a debugger to the application process and inspect
For more information visit: https://go.microsoft.com/fwlink/?LinkID=2028265

After we check stdout log file, this Error appears

  at Microsoft.Extensions.Configuration.FileConfigurationProvider.HandleException(ExceptionDispatchInfo info)
   at Microsoft.Extensions.Configuration.FileConfigurationProvider.Load(Boolean reload)
   at Microsoft.Extensions.Configuration.FileConfigurationProvider.Load()
   at Microsoft.Extensions.Configuration.ConfigurationRoot..ctor(IList`1 providers)
   at Microsoft.Extensions.Configuration.ConfigurationBuilder.Build()
   at Microsoft.Extensions.Hosting.HostBuilder.BuildAppConfiguration()
   at Microsoft.Extensions.Hosting.HostBuilder.Build()
   at ArtanNet.Program.Main(String[] args) in C:\Users\Administrator\Desktop\ArtanNet\ArtanNet\Program.cs:line 16

program.cs file code is:

 public class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }

web.congig:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
  <location path="." inheritInChildApplications="false">
    <system.webServer>
      <handlers>
        <add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModuleV2" resourceType="Unspecified" />
      </handlers>
      <aspNetCore processPath=".\ArtanNet.exe" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" hostingModel="inprocess" />
    </system.webServer>
  </location>
</configuration>
<!--ProjectGuid: d6cea5f9-6e6d-4f03-b6e9-1d0fb599d508-->

and now please help us to fix this error

Solution 1

Which Core version are you using? And what Hosting Model you are using? IN Of Process or Out of Process? You can check thios in you csproj file. if you using In of Process, try to change it to

 <AspNetCoreHostingModel>OutOfProcess</AspNetCoreHostingModel>

Solution 2

We've just encountered this with .net core 6.0.1. The issue turns out to be that our server had both the 64bit and 32bit versions of ASP.NET Core 6.0.1 Shared Framework installed. We removed the 32bit version, rebooted the server, sent a stern email to our server team and all worked fine ;-)

Comments

[marc_s]

Check the system event log for error messages - well - did you? What did it tell you?

[Lex Li]

“The app started but threw an exception during startup” and "FileConfigurationProvider.HandleException" are clear indicators of the cause.

[John Wu]

Seems like it having trouble reading the configuration file. Make sure it is present and contains well-formed XML.

[Bruce Zhang]

Have you tried to create a new empty core application and published on IIS? And please post web.config so that I can check the format of XML code.

[Mahmudul Hasan]

Facing the same error. My app works on my machine perfectly in both debug and release mode. Bud doe not if I uploaded it to the server.

[mohammad rahimi]

Dotnet version : 5.0.103 hosting model:ìn process

[fuzzy_logic]

Just FYI - there's a trade off for changing it, as per MS doco. "In-process hosting provides improved performance over out-of-process hosting because requests aren't proxied over the loopback adapter".