IIS HTTP 错误 503。服务不可用

Question

我正在使用 EC2 在 IIS 上部署我的 ASP.net 核心 MVC Web 应用程序。我发布了一个中型项目，浏览器显示以下消息“HTTP 错误 503。服务不可用。 “ 我已经发布了另一个新项目“Empty”，其设置与之前的项目相同，并且发布成功我尝试了很多解决方案，例如：

确保应用程序轮询未停止
将加载用户配置文件设置为 false
检查以下路径的日志文件

C:\Windows\System32\LogFiles\HTTPERR

2021-03-18 22:12:09 ***.**.**.** 3380 ***.**.**.** 80 HTTP/1.1 GET / - 503 4 AppOffline TestApplication

C:\inetpub\logs\LogFiles\W3SVC4

2021-03-18 20:57:27 ::1 GET / - 80 - ::1 Mozilla/5.0+(Windows+NT+10.0;+WOW64;+Trident/7.0;+rv:11.0)+like+Gecko - localhost 503 0 1115 4833 264 24

2021-03-18 20:57:27 ::1 GET /favicon.ico - 80 - ::1 Mozilla/5.0+(Windows+NT+10.0;+WOW64;+Trident/7.0;+rv:11.0)+like+Gecko - localhost 503 0 1115 4856 206 6

我不明白这个错误，希望得到一些帮助

顺便说一句 我之前在 Azure 上发布了相同的 Web 应用程序，它已经启动运行。现在我正在尝试使用 IIS 重新发布是否以前的发布可能导致此问题？

startup.cs 文件

using System;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Hosting;
using Microsoft.EntityFrameworkCore;
using Qessa.Data;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Qessa.Models;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Hangfire;
using Qessa.Services;
using Microsoft.AspNetCore.Identity.UI.Services;
using Microsoft.AspNetCore.Authentication.Cookies;
using Microsoft.AspNetCore.Http;


namespace Qessa
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {

            services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme).AddCookie();
            services.ConfigureApplicationCookie(options =>
            {
                options.Cookie.Name = ".ExpirationCookie";
                options.Cookie.IsEssential = true;
                options.Cookie.HttpOnly = true;
                //options.LoginPath = "/Identity/Pages/Account/Login";
                options.AccessDeniedPath = "/Identity/Pages/Account/AccessDenied"; 
                options.ExpireTimeSpan = TimeSpan.FromMinutes(60);
                options.SlidingExpiration = true;
                options.Cookie.SecurePolicy = CookieSecurePolicy.Always;
                options.Events = new CookieAuthenticationEvents
                {
                    OnValidatePrincipal = ValidateAsync.ValidatingAsync
                };
            })
            .Configure<SecurityStampValidatorOptions>(options =>
            {
                options.ValidationInterval = TimeSpan.FromMinutes(0); //1 minute for testing, This time should be zero, so once the user account turned to expired it will waits for this time then force logout.
            });

            services.AddDbContext<ApplicationDbContext>(options =>
              options.UseSqlServer(
                  Configuration.GetConnectionString("DefaultConnection")));

            services.AddIdentity<IdentityUser, IdentityRole>(options => {
                options.SignIn.RequireConfirmedAccount = false;
                //options.User.AllowedUserNameCharacters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-._@+";
            })
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultTokenProviders(); 

            services.AddIdentityCore<ApplicationUser>()
                .AddRoles<IdentityRole>()
                .AddClaimsPrincipalFactory<UserClaimsPrincipalFactory<ApplicationUser, IdentityRole>>()
                .AddEntityFrameworkStores<ApplicationDbContext>()
                .AddDefaultUI();

            services.AddSingleton<IEmailSender, EmailSender>();
            services.Configure<EmailOptions>(Configuration);

            services.AddHangfire(config => config.UseSqlServerStorage(Configuration.GetConnectionString("DefaultConnection")));
            services.AddHangfireServer();


            services.AddControllersWithViews(); 
            services.AddRazorPages().AddRazorRuntimeCompilation();

            services.AddScoped<IDbInitializer, DbInitializer>();

            services.AddScoped<IExpirationJob, ExpirationJob>();
            services.AddScoped<IReminderJob, EmailReminder>();

            services.AddSingleton<IActionContextAccessor, ActionContextAccessor>();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app,
            IWebHostEnvironment env,
            IRecurringJobManager recurringJobManager,
            IServiceProvider serviceProvider,
            IDbInitializer dbInitializer)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseDatabaseErrorPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }
            dbInitializer.Initialize();
            app.UseHttpsRedirection();
            app.UseStaticFiles();


            app.UseHangfireDashboard();
            app.UseHangfireDashboard("/hangfire", new DashboardOptions()
            {
                Authorization = new[] { new CustomAuthorizeFilter() }
            });


            app.UseRouting();


            app.UseAuthentication();
            app.UseAuthorization();


            app.UseCookiePolicy();

            recurringJobManager.AddOrUpdate(
               "End Users Subscription",
               () => serviceProvider.GetService<IExpirationJob>().SetExpired(),
               Cron.Daily
               );

            recurringJobManager.AddOrUpdate(
               "Send End of Subscription Reminder",
               () => serviceProvider.GetService<IReminderJob>().SendReminder(),
               Cron.Daily
               );

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Index}/{id?}");
                endpoints.MapRazorPages();
            });
        }
    }
}

appsetting.json 文件

{
  "ConnectionStrings": {
    "DefaultConnection": "Server=LAPTOP-CPJTBQI1;Database=QessaDB;Trusted_Connection=True;MultipleActiveResultSets=true"
  },
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    },

    "name": "asp.net",
    "private": true,
    "dependencies": {
      "bootstrap": "3.3.7",
      "jquery": "3.1.1",
      "jquery-validation": "1.16.0",
      "jquery-validation-unobtrusive": "3.2.6",
      "requirejs": "2.3.3",
      "chart.js": "2.5.0"
    }

  },
  "SendGridKey": "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",
  "AllowedHosts": "*"
}

Answer 1

事实证明问题是我的 Appsetting.json

中没有有效的连接字符串

我的 startup.cs 文件正在调用 dbInitializer，它需要一个有效的数据库连接我努力寻找连接字符串的正确形式，如果有人需要它，这是一种形式：

    "DefaultConnection": "Server=data.*************.rds.amazonaws.com;database=data;uid=*****;pwd=*****;"

ps：我的数据库由 AWS 托管

谢谢大家

IIS HTTP 错误 503。服务不可用

IIS HTTP Error 503. The service is unavailable

iis

amazon-ec2

amazon-web-services

asp.net-core