System.InvalidOperationException：验证Azure AD令牌时IDX20803

Question

我在Angular中有一个SPA客户端，该客户端成功登录到Azure AD并生成令牌，然后将其通过Authorization: Bearer ${token}传递给.Net Core（3.0）API，然后尝试使用[Authorize]验证令牌以进行检查然后允许访问REST Api调用，我们仍在使用"ver": "1.0"，并且JWT标头中没有随机数。我在ConfigureServices方法中有以下代码：

services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
               .AddJwtBearer(options =>
               {
                   options.Authority = "https://login.microsoftonline.com/common";
                   options.RequireHttpsMetadata = false;
                   options.TokenValidationParameters = new TokenValidationParameters
                   {
                       ValidateIssuer = true,
                       ValidIssuer = options.Authority,
                       ValidateLifetime = true,
                       ValidateAudience = true,
                       ValidAudience = "{myClientID}",
                       IssuerValidator = (issuer, token, parameter) => "https://sts.windows.net/{MyIssuer}/"
                   };
               });

            services.AddAuthorization(options =>
            {
                options.DefaultPolicy =
                     new AuthorizationPolicyBuilder(JwtBearerDefaults.AuthenticationScheme)
                    .RequireAuthenticatedUser()
                    .Build();
            });

当我使用locahost运行项目时，它工作正常，但是将代码部署到服务器上，却出现以下错误消息：

Exception occurred while processing message.

Exception: 
System.InvalidOperationException: IDX20803: Unable to obtain configuration from: 'https://login.microsoftonline.com/common/.well-known/openid-configuration'.
 ---> System.IO.IOException: IDX20804: Unable to retrieve document from: 'https://login.microsoftonline.com/common/.well-known/openid-configuration'.
 ---> System.Net.Http.HttpRequestException: No connection could be made because the target machine actively refused it.
 ---> System.Net.Sockets.SocketException (10061): No connection could be made because the target machine actively refused it.
   at System.Net.Http.ConnectHelper.ConnectAsync(String host, Int32 port, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---

以上消息表明我不允许某些人连接到该站点进行验证，我的参数正确吗？我使用jwt.io检查令牌，它说签名有效，并且在正文上可以看到期望的"aud:","iss:" "amr":["pwd"]等值。我是Azure AD和令牌验证的新手，所以请耐心等待。我有什么想念的吗？谢谢

Answer 1

该错误是由于该应用无法连接到Azure AD元数据终结点而引起的。它需要从一开始就从那里加载配置，包括应用可以用来验证令牌签名的公共密钥。

要么是某种原因阻止了连接（例如防火墙），要么Azure AD已关闭（极不可能）。