Question 87547 in ASP.NET Question posted in
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Hosting ASP.NET on Raspberry Pi 3B+ for local network

I am trying to host an API (ASP.NET) on my Raspberri Pi 3B +. I would like to access this API swagger page from my laptop/phone/pc etc.

What I’ve tried until now:
Installed, compiled, built and ran the web application with dotnet on my RPi.

running dotnet --info on the RPi provides us the following information:

.NET SDK (reflecting any global.json):
 Version:   5.0.405
 Commit:    63325e1c7d

Runtime Environment:
 OS Name:     raspbian
 OS Version:  11
 OS Platform: Linux
 RID:         linux-arm
 Base Path:   /usr/share/dotnet/sdk/5.0.405/

Host (useful for support):
  Version: 5.0.14
  Commit:  d5b56c6327

.NET SDKs installed:
  5.0.405 [/usr/share/dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 5.0.14 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 5.0.14 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

When I run the program (filepath ~/first-rpi-api/bin/Release/net5.0/publish/first-rpi-api)

I get the following:

info: Microsoft.Hosting.Lifetime[0]
      Now listening on: http://localhost:5000
info: Microsoft.Hosting.Lifetime[0]
      Now listening on: https://localhost:5001
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Production
info: Microsoft.Hosting.Lifetime[0]
      Content root path: /home/pi/first-rpi-api/bin/Release/net5.0/publish

The default URL for the swagger UI would be : https://localhost:44335/swagger/index.html
However when I try to access the API from my PC on URL : https://RPi_IP:5000/swagger/index.html

I get ERR_CONNECTION_REFUSED

How do I fix this ? Have I missed something and how would I approach this problem ?

Tags:

2

Answers


  1. 0 
    info: Microsoft.Hosting.Lifetime[0]
      Now listening on: http://localhost:5000
info: Microsoft.Hosting.Lifetime[0]
      Now listening on: https://localhost:5001

    Listening on localhost means that it’s only listening to network connections from the same machine (which is the Raspberry Pi, in your case). If you want it to listen to network connections from outside the machine, you need to listen to 0.0.0.0.

    Without seeing your code that sets up network conncetions, it’s hard to be sure what a fix that would integrate well would look like but try doing this before running your program:

    export ASPNETCORE_URLS="http://*:5000;https://*:5001"

    That will make your application allow connections from anywhere.

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  2. 0

    Using the previous answer (refering to omajid’s answer) provides us only a temporary solution.

    Whenever you reboot the Raspberry Pi you would need to execute the command

    export ASPNETCORE_URLS="http://*:5000;https://*:5001"

    again and again.

    To prevent this, I suggest using the IHostBuilder.UseUrls("URLS") method.

    In your case you would need to edit your Program.cs and add the following line in the CreateHostBuilder method.

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

                    //THIS LINE
                    webBuilder.UseUrls("http://*:5000;https://*:5001"); 
                });

    This will automatically ensures that you can access the API from whichever device you’d like.

    You can read more about this in this article :

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