aspNet core Linux 404 not found from LAN

Question

I deployed my first .netCore application on Linux environment. Using Lubuntu 18.04.

I tried first with apache2, but since I had a problem reaching it from outside, I configured nginx and tried without much success to do it.

My application is running on port 5000 with dotnet command, as follow

usr:/inetpub/www/WebApi$ dotnet WebApi.dll --urls=http://:::5000/
Hosting environment: Production
Content root path: /inetpub/www/WebApi
Now listening on: http://[::]:5000
Application started. Press Ctrl+C to shut down.

And this is the Program.cs file where I read for the --url input parameter:

public class Program
{
    public static void Main(string[] args)
    {

        XmlDocument log4netConfig = new XmlDocument();
        log4netConfig.Load(File.OpenRead("log4net.config"));
        ILoggerRepository repo = LogManager.CreateRepository(Assembly.GetEntryAssembly(),
                   typeof(log4net.Repository.Hierarchy.Hierarchy));
        log4net.Config.XmlConfigurator.Configure(repo, log4netConfig["log4net"]);

        //CreateWebHostBuilder(args).Build().Run();


        if (args != null && args.Count() > 0)
        {

            var configuration = new ConfigurationBuilder()
                .AddCommandLine(args)
                .Build();

            var host = new WebHostBuilder()
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseConfiguration(configuration)
                .UseIISIntegration()
                .UseStartup<Startup>()
                .Build();

            host.Run();
        }
        else
        {
            var host = new WebHostBuilder()
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .UseIISIntegration()
                .UseStartup<Startup>()
                .UseUrls("http://*:8080/")
                .Build();

            host.Run();
        }
    }
}

This is my default file inside nginx's sites-available folder.

server {
    listen        80;
    server_name  _;
    location / {
        proxy_pass         http://localhost:5000;
        proxy_http_version 1.1;
        proxy_set_header   Upgrade $http_upgrade;
        proxy_set_header   Connection keep-alive;
        proxy_set_header   Host $host;
        proxy_cache_bypass $http_upgrade;
        proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header   X-Forwarded-Proto $scheme;
    }
}

This is my nginx.conf file

user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;

events {
        worker_connections 768;
        # multi_accept on;
}

http {

        ##
        # Basic Settings
        ##

        sendfile on;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 65;
        types_hash_max_size 2048;
        # server_tokens off;

        # server_names_hash_bucket_size 64;
        # server_name_in_redirect off;

        include /etc/nginx/mime.types;
        default_type application/octet-stream;

        ##
        # SSL Settings
        ##

        ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
        ssl_prefer_server_ciphers on;

        ##
        # Logging Settings
        ##

        access_log /var/log/nginx/access.log;
        error_log /var/log/nginx/error.log;

        ##
        # Gzip Settings
        ##

        gzip on;
        # gzip_vary on;
        # gzip_proxied any;
        # gzip_comp_level 6;
        # gzip_buffers 16 8k;
        # gzip_http_version 1.1;
        # gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;

        ##
        # Virtual Host Configs
        ##

        include /etc/nginx/conf.d/*.conf;
        include /etc/nginx/sites-enabled/*;
}


#mail {
#       # See sample authentication script at:
#       # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
# 
#       # auth_http localhost/auth.php;
#       # pop3_capabilities "TOP" "USER";
#       # imap_capabilities "IMAP4rev1" "UIDPLUS";
# 
#       server {
#               listen     localhost:110;
#               protocol   pop3;
#               proxy      on;
#       }
# 
#       server {
#               listen     localhost:143;
#               protocol   imap;
#               proxy      on;
#       }
#}

This is my WebApi Core Startup.cs file

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.Configure<CookiePolicyOptions>(options =>
        {
            options.CheckConsentNeeded = context => true;
            options.MinimumSameSitePolicy = SameSiteMode.None;
        });
        services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);

        DapperExtensions.DapperExtensions.SqlDialect = new DapperExtensions.Sql.MySqlDialect();

        ConnectionString connectionString = new ConnectionString();
        connectionString._ConnectionString = new Parameters.AppSettingsParameter().getConnectionString();

        services.AddSingleton<IConnectionString>(connectionString);

        services.AddScoped<ICustomerRepository>(x => new Infrastructure.Dapper.EntitiesRepository.CustomerRepository(connectionString));
        services.AddScoped<IDeviceRepository>(x => new Infrastructure.Dapper.EntitiesRepository.DeviceRepository(connectionString));
        services.AddScoped<IWebApiVideoRepository>(x => new Infrastructure.Dapper.EntitiesRepository.WebApiVideoRepository(connectionString));
        services.AddScoped<IMessageServiceTokenRepository>(x => new Infrastructure.Dapper.EntitiesRepository.MessageServiceTokenRepository(connectionString));
        services.AddScoped<IPriceRepository>(x => new Infrastructure.Dapper.EntitiesRepository.PriceRepository(connectionString));
        services.AddScoped<IServiceRepository>(x => new Infrastructure.Dapper.EntitiesRepository.ServiceRepository(connectionString));
        services.AddScoped<IWebApiVideoDownloadFromDeviceRepository>(x => new Infrastructure.Dapper.EntitiesRepository.WebApiVideoDownloadFromDeviceRepository(connectionString));
        services.AddScoped<IWebApiVideoValidationRefusedRepository>(x => new Infrastructure.Dapper.EntitiesRepository.WebApiVideoValidationRefusedRepository(connectionString));
        services.AddScoped<ITokenKeyRepository>(x => new Infrastructure.Dapper.EntitiesRepository.TokenKeyRepository(connectionString));
    }

    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }

        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();

        app.UseMiddleware<RequestResponseLoggingMiddleware>();

        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Init}/{action=Initialize}");
        });
    }
}

If I go to localhost, I can ping the application running on 5000 port.

Going from another computer to 192.168.1.46 (my linux pc's address) gets the 404 error page.

This is the result from nmap command:

PORT   STATE SERVICE
80/tcp open  http

this is my iptable -L command:

Chain INPUT (policy ACCEPT)
num  target     prot opt source               destination         
1    ACCEPT     tcp  --  anywhere             anywhere             tcp dpt:http
2    ufw-before-logging-input  all  --  anywhere             anywhere            
3    ufw-before-input  all  --  anywhere             anywhere            
4    ufw-after-input  all  --  anywhere             anywhere            
5    ufw-after-logging-input  all  --  anywhere             anywhere            
6    ufw-reject-input  all  --  anywhere             anywhere            
7    ufw-track-input  all  --  anywhere             anywhere            
8    ACCEPT     all  --  anywhere             anywhere            
9    ACCEPT     tcp  --  anywhere             anywhere             state NEW tcp dpt:http

Chain FORWARD (policy ACCEPT)
num  target     prot opt source               destination         
1    ufw-before-logging-forward  all  --  anywhere             anywhere            
2    ufw-before-forward  all  --  anywhere             anywhere            
3    ufw-after-forward  all  --  anywhere             anywhere            
4    ufw-after-logging-forward  all  --  anywhere             anywhere            
5    ufw-reject-forward  all  --  anywhere             anywhere            
6    ufw-track-forward  all  --  anywhere             anywhere            

Chain OUTPUT (policy ACCEPT)
num  target     prot opt source               destination         
1    ufw-before-logging-output  all  --  anywhere             anywhere            
2    ufw-before-output  all  --  anywhere             anywhere            
3    ufw-after-output  all  --  anywhere             anywhere            
4    ufw-after-logging-output  all  --  anywhere             anywhere            
5    ufw-reject-output  all  --  anywhere             anywhere            
6    ufw-track-output  all  --  anywhere             anywhere            

Chain ufw-after-forward (1 references)
num  target     prot opt source               destination         

Chain ufw-after-input (1 references)
num  target     prot opt source               destination         

Chain ufw-after-logging-forward (1 references)
num  target     prot opt source               destination         

Chain ufw-after-logging-input (1 references)
num  target     prot opt source               destination         

Chain ufw-after-logging-output (1 references)
num  target     prot opt source               destination         

Chain ufw-after-output (1 references)
num  target     prot opt source               destination         

Chain ufw-before-forward (1 references)
num  target     prot opt source               destination         

Chain ufw-before-input (1 references)
num  target     prot opt source               destination         

Chain ufw-before-logging-forward (1 references)
num  target     prot opt source               destination         

Chain ufw-before-logging-input (1 references)
num  target     prot opt source               destination         

Chain ufw-before-logging-output (1 references)
num  target     prot opt source               destination         

Chain ufw-before-output (1 references)
num  target     prot opt source               destination         

Chain ufw-reject-forward (1 references)
num  target     prot opt source               destination         

Chain ufw-reject-input (1 references)
num  target     prot opt source               destination         

Chain ufw-reject-output (1 references)
num  target     prot opt source               destination         

Chain ufw-track-forward (1 references)
num  target     prot opt source               destination         

Chain ufw-track-input (1 references)
num  target     prot opt source               destination         

Chain ufw-track-output (1 references)
num  target     prot opt source               destination

This is my netstat command:

Proto CodaRic CodaInv Indirizzo locale        Indirizzo remoto       Stato       PID/Program name    
tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN      21391/mysqld        
tcp        0      0 0.0.0.0:80              0.0.0.0:*               LISTEN      19096/nginx: master 
tcp        0      0 0.0.0.0:55250           0.0.0.0:*               LISTEN      17341/anydesk       
tcp        0      0 127.0.0.53:53           0.0.0.0:*               LISTEN      738/systemd-resolve 
tcp        0      0 127.0.0.1:631           0.0.0.0:*               LISTEN      29185/cupsd         
tcp        0      0 0.0.0.0:7070            0.0.0.0:*               LISTEN      17341/anydesk       
tcp6       0      0 :::5000                 :::*                    LISTEN      19464/dotnet        
tcp6       0      0 :::80                   :::*                    LISTEN      19096/nginx: master 
tcp6       0      0 :::21                   :::*                    LISTEN      1037/vsftpd         
tcp6       0      0 ::1:631                 :::*                    LISTEN      29185/cupsd         
udp        0      0 0.0.0.0:60895           0.0.0.0:*                           938/avahi-daemon: r 
udp        0      0 127.0.0.53:53           0.0.0.0:*                           738/systemd-resolve 
udp        0      0 0.0.0.0:68              0.0.0.0:*                           1691/dhclient       
udp        0      0 0.0.0.0:631             0.0.0.0:*                           29186/cups-browsed  
udp        0      0 224.0.0.251:5353        0.0.0.0:*                           29228/chrome        
udp        0      0 224.0.0.251:5353        0.0.0.0:*                           29228/chrome        
udp        0      0 0.0.0.0:5353            0.0.0.0:*                           938/avahi-daemon: r 
udp6       0      0 :::39611                :::*                                938/avahi-daemon: r 
udp6       0      0 :::5353                 :::*                                938/avahi-daemon: r

This is the log from this command: sudo tcpdump -i any tcp port 80 when I try to call my ip from another pc in LAN:

00:06:31.785311 IP 192.168.1.44.63326 > WebApi.http: Flags [F.], seq 1, ack 1, win 256, length 0
00:06:31.785407 IP WebApi.http > 192.168.1.44.63326: Flags [F.], seq 1, ack 2, win 229, length 0
00:06:31.785599 IP 192.168.1.44.63362 > WebApi.http: Flags [S], seq 1225666604, win 64240, options [mss 1460,nop,wscale 8,nop,nop,sackOK], length 0
00:06:31.785635 IP WebApi.http > 192.168.1.44.63362: Flags [S.], seq 4261901272, ack 1225666605, win 29200, options [mss 1460,nop,nop,sackOK,nop,wscale 7], length 0
00:06:31.787248 IP 192.168.1.44.63327 > WebApi.http: Flags [P.], seq 461:921, ack 138, win 256, length 460: HTTP: GET / HTTP/1.1
00:06:31.787272 IP WebApi.http > 192.168.1.44.63327: Flags [.], ack 921, win 245, length 0
00:06:31.788867 IP WebApi.http > 192.168.1.44.63327: Flags [P.], seq 138:275, ack 921, win 245, length 137: HTTP: HTTP/1.1 404 Not Found
00:06:31.790175 IP 192.168.1.44.63326 > WebApi.http: Flags [.], ack 2, win 256, length 0
00:06:31.790513 IP 192.168.1.44.63362 > WebApi.http: Flags [.], ack 1, win 256, length 0
00:06:31.832376 IP 192.168.1.44.63327 > WebApi.http: Flags [.], ack 275, win 255, length 0

I'm struggling on that and I can't figure out how the hell I can make it work. The only thing I can say is that if my dotnet application is running, I get the 404 error. If it's not running I get the 502 Bad Gateway error.

What the hell can I do to make it work?

PS: I added everything I thought at, if it misses something, feel free to ask for implementations

Thanks you all

I tried your configuration above. Since I don't have all your ASP.NET Core codes, so I use I own project. And also I don't have an IPv6 enabled linux server , so I use an IPv4 configuration instead (namely make the kestrel listen on --urls=http://0.0.0.0:5000). Your nginx configuration works fine for me if I use --urls=http://0.0.0.0:5000. Could you please try that? — itminus
– itminus, Commented Mar 26, 2019 at 11:01
@itminus I tried to delete all my .netCore project's files and I copied them all back and it started to work. Probably a file got corrupted or something similar during the first copy.. Awkard. Thanks anyway! — Pier Giorgio Misley
– Pier Giorgio Misley, Commented Mar 27, 2019 at 9:11

Pier Giorgio Misley · Accepted Answer · 2019-03-27 09:14:19Z

1

Somehow I suppose a file got corrupted during the publish process; I deleted and copied back all files of my .netCore project and things started to work.

That said, I will keep this question since I think it shares some configurations that might be useful to someone else, since at this point I suppose those are correct :)

Thanks anyway for the support

answered Mar 27, 2019 at 9:14

Pier Giorgio Misley

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