C# – asp.net core app deployed on iis meets 500 internal server error

asp.net-coreciis

🙁 Oops.
500 Internal Server Error
An error occurred while starting the application.

This message came out when I added database functionality to my asp.net core app and deployed it to iis. When I developed it in Visual Studio, everything went well. But after deploying, this error messages appeared.

I tried to use dotnet myapp.dll to run my app in the deploy folder, and found out it worked well. It is likely that the problem is relation to iis. I tried to add <compilation debug="true">..</compilation> to web.config, but it seems useless. What is problem are actually, or is there any other way to see the detailed error info to help find out what's happened?

Best Answer

Change stdoutLogEnabled="false" to true and then check the logs at stdoutLogFile=".\logs\stdout". The error(s) there might tell you something.
Check that you set up right Environment Name using ASPNETCORE_ENVIRONMENT environment variable as so use correct settings like connection string. On your machine by default you have "Development" environment.
You may use Error Handling middlewares for showing exceptions like
```
app.UseDeveloperExceptionPage();
```

On IIS 6

<configuration>
    <system.web>
        <customErrors mode="Off"/>
        <compilation debug="true"/>
    </system.web>
</configuration>

On IIS 7

<configuration>
    <system.webServer>
        <httpErrors errorMode="Detailed" />
        <asp scriptErrorSentToBrowser="true"/>
    </system.webServer>
    <system.web>
        <customErrors mode="Off"/>
        <compilation debug="true"/>
    </system.web>
</configuration>

Note: You can avoid the Debug=true. You only need to close the custom errors for a while and get the detailed error page.

Reference: Enabling Windows custom error messaging in Go Daddy's help articles.

Also, this can help: How to enable the detailed error messages (from IIS).

C# – IIS Server & ASP.Net Core – 500.19 with error code 0x8007000d on httpplatformhandler tag

I was getting this error. I fixed this error by installing the .NET Core Windows Server Hosting bundle (vs the Runtime Bundle), as described in instructions like this one.

Install the .NET Core Hosting Bundle

Install the .NET Core Hosting Bundle on the hosting system. The bundle installs the .NET Core Runtime, .NET Core Library, and the ASP.NET Core Module. The module creates the reverse proxy between IIS and the Kestrel server. If the system doesn't have an Internet connection, obtain and install the Microsoft Visual C++ 2015 Redistributable before installing the .NET Core Hosting Bundle.

As @Patrick says you can download the bundle installables from this link.

After installing that Module, my app served (i.e. no 500 error).

I see @Jørgen made this comment on OP already, so he gets credit.

EDIT Please confirm you install the Hosting bundle vs the Runtime Bundle per comment by @MDave

Did you install the .NET Core Windows Server Hosting bundle? This is needed for IIS to work as a reverse proxy for the .net core libraries. You'll find the link in this article: docs.microsoft.com/en-us/aspnet/core/publishing/iis I had the same problem before installing this on my dev machine. – Jørgen Tvedt Mar 28 at 6:31

Best Answer

Related Solutions

Deploying website: 500 – Internal server error

On IIS 6

On IIS 7

C# – IIS Server & ASP.Net Core – 500.19 with error code 0x8007000d on httpplatformhandler tag

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