ERR_SSL_PROTOCOL_ERROR when running BlazorWebAppOidcServer

Question

0

I am trying the sample code from

https://github.com/dotnet/blazor-samples/tree/main/8.0/BlazorWebAppOidcServer.

The Home and Count components work fine but the Login results in :

This site can’t provide a secure connection localhost sent an invalid response.

Try running Windows Network Diagnostics. ERR_SSL_PROTOCOL_ERROR

I am using .NET 8 and have tried these trouble shooting steps with no success:

1- adjust lunchsettings.js: "sslPort": 5001 2- used http instead of https 3- cleared browser

P.S. The oidcOptions are working fine in another example https://github.com/Azure-Samples/active-directory-aspnetcore-webapp-openidconnect-v2/tree/master/1-WebApp-OIDC/1-5-B2C meaning I can sign in and out normally

Answer 1

Hi Zahra Ghadyani

Thank you for reaching out to Microsoft Q & A forum.     

Thanks for reaching out. The ERR_SSL_PROTOCOL_ERROR typically indicates a problem with the local HTTPS configuration or development certificate. 

Please try the following steps: 

1.Reset and trust the development certificate by running: 

dotnet dev-certs https --clean  
dotnet dev-certs https --trust

2.Check your launchSettings.json to ensure the HTTPS settings are correct: 

"applicationUrl": "https://localhost:5001",
"sslPort": 5001

3.Try accessing the app in a different browser or an incognito/private window to rule out caching or certificate issues. 

Also, ensure all redirect URIs in your configuration use HTTPS consistently. 

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