Problem with code sample

Question

I am following this code sample step by step

https://learn.microsoft.com/en-us/azure/active-directory-b2c/configure-authentication-sample-web-app-with-api?tabs=visual-studio

but the web API is throwing error for localhost not found. Web app is working fine and after authentication when it try to call Web API it throws error because its not running on local host.

Answer 1

Hi @Anonymous ,

Thanks for reaching out.

I understand you are trying to call web API from web application but getting error as "https://localhost:44332" web API address is not found.

I configured the same applications in my lab and able to call web API successfully. If you have already started the localhost server of web API while calling from web application but still getting the error. The reason might be you have not trusted the certificate to call https endpoint.

.NET Core SDK already has certificate installed to the local user certificate store, but that also need to be trusted to call https.

You can trust the certificate with this command dotnet dev-certs https --trust

Make sure both the service and client server are up using command line rather than PowerShell.

As per documentation,
service server is running on https://localhost:44332
client server is running on https://localhost:5000.

Make sure the addresses are configured correctly.

Hope this will help.

Thanks,
Shweta

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Answer 2

Hi @Anonymous

Below are the configuration files I am using in my lab and able to call the API successfully

Client Configuration File

{
"AzureAdB2C": {
"Scopes": "access_as_user",
"Instance": "https://xxxx.b2clogin.com",
"ClientId": "xxxx",
"Domain": "xxx.onmicrosoft.com",
"SignedOutCallbackPath": "/B2C_1_signupsignin//oauth2/v2.0/logout/",
"SignUpSignInPolicyId": "B2C_1_signupsignin",
"ClientSecret": "xxx"
},
"TodoList": {
"TodoListScope": "https://xxxx.onmicrosoft.com/my-api/access_as_user",
"TodoListBaseAddress": "https://localhost:44332"

},
"Logging": {
"LogLevel": {
"Default": "Information",
"Microsoft": "Warning",
"Microsoft.Hosting.Lifetime": "Information"
}
},
"AllowedHosts": "*"
}

Server Configuration File:
{
"AzureAdB2C": {
"Instance": "https://xxx.b2clogin.com",
"ClientId": "xxx",
"Domain": "xxx.onmicrosoft.com",
"SignedOutCallbackPath": "/signout/B2C_1_SignIn",
"SignUpSignInPolicyId": "B2C_1_signupsignin"

},
"Kestrel": {
"Endpoints": {
"Http": {
"Url": "https://localhost:44332"
}
}
},
"Logging": {
"LogLevel": {
"Default": "Warning"
}
},
"AllowedHosts": "*"
}

If you are following the github sample https://github.com/Azure-Samples/active-directory-aspnetcore-webapp-openidconnect-v2/tree/master/4-WebApp-your-API/4-2-B2C to sync with the document then there is a wrong port mentioned here in client application to call web API. It should be 44332 in both web API and client application where Web API base address needs to call.

Thanks,
Shweta