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

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:^[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:^[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 ;-)

Solution 3:^[3]

I can fix this issue I change program.cs and add webbulder.useiis() in creatHostBuilder

 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>();
                    webBuilder.UseIis();
                });
    }

Solution 4:^[4]

This error message also comes when you try to install the published package to the ISP-hosted shared IIS server or an ISP-hosted Virtual Machine.

Deployment mode: Framework-Dependent
Target Runtime: Win-x64 or Portable

In my case, when I tried to deploy ASP.NET Core 5 application, it occurred due to not setting the change (read/write/delete) permission to the web application folder for the user group, basically the root folder.

Solution 5:^[5]

Also this error can show that your application has errors in config files (most common appsettings.json) so it can't be deserialized properly

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution	Source
Solution 1	Oliver Dzaeck
Solution 2	Phil Jones
Solution 3	mohammad rahimi
Solution 4	Dush
Solution 5	Tropin Alexey

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

Solution 1:[1]

Solution 2:[2]

Solution 3:[3]

Solution 4:[4]

Solution 5:[5]