C# 将.netcoreapp2.0升级到.netcoreapp2.1将开始从解析发现文档时出错https://ims.com/.well-known/openid-configuration

已将.NetCoreApp 2.0升级到2.1，并开始出现错误

从以下位置分析发现文档时出错：

连接到时出错：连接尝试失败，因为连接方在一段时间后没有正确响应，或者建立的连接失败，因为连接的主机没有响应

Startup.cs中的代码->

services.AddAuthentication()
                    .AddIdentityServerAuthentication(options =>
                    {
                        options.Authority = this.Configuration["Authentication:Authority"];
                        options.ApiName = this.Configuration["Authentication:ApiName"];
                        options.ApiSecret = this.Configuration["Authentication:ApiSecret"];

                        options.EnableCaching = true;
                        options.RequireHttpsMetadata = true;

                         var certException = new CertException(this.Configuration["Authentication:Thumbprint"]);
                            options.IntrospectionDiscoveryHandler = certException.CreateHandler();
                            options.IntrospectionBackChannelHandler = certException.CreateHandler();
                            options.JwtBackChannelHandler = certException.CreateHandler();

                    });

当我从本地开发visual studio访问云上托管的identity server时，就会发生这种情况