I am trying to use Microsoft Identity Server to integrate with Okta in dotnet core 6.0 project. I followed a sample code to add Okta as external identity provider.

builder.Services.AddAuthentication()

  .AddOpenIdConnect("okta", "Okta", options =>

  {

    options.SignInScheme = IdentityServerConstants.ExternalCookieAuthenticationScheme;

    options.SignOutScheme = IdentityServerConstants.SignoutScheme;

    options.Authority = $"https://{OktaDomain}/oauth2/default";

    options.ClientId = ClientId;

    options.ClientSecret = ClientSecret;

    options.ResponseType = "code";

    options.Scope.Add("openid");

    options.Scope.Add("profile");

    options.Scope.Add("email");

    options.SaveTokens = true;

    options.TokenValidationParameters = new TokenValidationParameters

    {

      NameClaimType = "name",

      RoleClaimType = "role"

    };

  });

However, on code execution I received the following error.

2024-06-19 16:54:54.139 -04:00 [ERR] ErrorException "IDX20803: Unable to obtain configuration from: 'https://https://dev-945062.okta.com/oauth2/default/.well-known/openid-configuration'. Will retry at '6/19/2024 8:55:04 PM +00:00'. Exception: 'System.IO.IOException: IDX20804: Unable to retrieve document from: '[PII of type 'System.String' is hidden. For more details, see https://aka.ms/IdentityModel/PII.]'.

 ---> System.Net.Http.HttpRequestException: No such host is known. (https:443)

I am looking for guidance to help me troubleshoot this error.

Best regards,

Muhammad Piracha.