Nginx返回404，无法代理至fastcgi-mono-server4问题求助

问题描述 #

在Ubuntu环境部署ASP.NET基础应用，已安装所有必要组件，尝试通过Nginx提供index.html或index.aspx服务，但Nginx始终返回404，请求从未转发至fastcgi-mono-server4。

启动Mono服务器的命令 #

fastcgi-mono-server4 /loglevels=All /printlog /verbose /applications=/:/opt/esoa /socket=tcp:127.0.0.1:9000

Nginx配置 #

server {
            listen 80;
            server_name _;

            location / {
                    root /opt/esoa;

                    index index.html;
                    access_log /var/log/nginx/esoa.log;

                    fastcgi_param SERVER_NAME $host;
                    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                    fastcgi_param PATH_INFO "";

                    fastcgi_pass 127.0.0.1:9000;
                    include /etc/nginx/fastcgi_params;
            }
    }

Mono服务器启动日志 #

6611: 1 fastcgi-mono-server [2023-01-27 01:34:35.980188] Debug  : fastcgi-mono-server4
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:35.987638] Debug  : Uid 1000, euid 1000, gid 1000, egid 1000
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:35.988138] Debug  : Root directory: /home/ubuntu/test
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:35.989834] Notice : Adding applications '/:/opt/esoa'...
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:35.990535] Notice : Registering application:
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:35.990600] Notice :     Host:          any
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:35.990651] Notice :     Port:          any
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:35.990701] Notice :     Virtual path:  /
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:35.990765] Notice :     Physical path: /opt/esoa/
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:36.005144] Debug  : Parsed tcp:127.0.0.1:9000 as URI tcp:127.0.0.1:9000
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:36.027285] Debug  : Listening on port: 9000
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:36.027847] Debug  : Listening on address: 127.0.0.1
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:36.031714] Debug  : Max connections: 1024
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:36.031817] Debug  : Max requests: 1024
 6611: 1 fastcgi-mono-server [2023-01-27 01:34:36.031973] Debug  : Multiplex connections: False
 6611: 3 fastcgi-mono-server [2023-01-27 01:34:36.036418] Debug  : Server started [callback: Mono.WebServer.FastCgi.ServerProxy]

测试结果 #

ubuntu@ip-XXX-31-XXX-XXX:~$ wget http://127.0.0.1/index.html
--2023-01-27 01:51:58--  http://127.0.0.1/index.html
Connecting to 127.0.0.1:80... connected.
HTTP request sent, awaiting response... 404 Not Found
2023-01-27 01:51:58 ERROR 404: Not Found.

排查与解决步骤 #

1. 检查文件路径与权限 #

• 确认/opt/esoa目录下存在目标文件：

  ls -l /opt/esoa/
  

• 赋予Nginx进程（通常为www-data用户）读取权限：

  chown -R www-data:www-data /opt/esoa
  chmod -R 755 /opt/esoa
  

2. 调整Nginx配置参数顺序 #

include /etc/nginx/fastcgi_params会覆盖自定义参数，需将其移至自定义参数之前，同时添加index.aspx作为索引选项：

server {
            listen 80;
            server_name _;

            location / {
                    root /opt/esoa;

                    index index.html index.aspx;
                    access_log /var/log/nginx/esoa.log;

                    include /etc/nginx/fastcgi_params;
                    fastcgi_param SERVER_NAME $host;
                    fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name;
                    fastcgi_param PATH_INFO "";

                    fastcgi_pass 127.0.0.1:9000;
            }
    }

修改后重启Nginx：

systemctl restart nginx

3. 验证FastCGI端口连通性 #

检查9000端口是否可正常访问：

nc -zv 127.0.0.1 9000

若连接失败，重启fastcgi-mono-server4：

pkill fastcgi-mono-server4
fastcgi-mono-server4 /loglevels=All /printlog /verbose /applications=/:/opt/esoa /socket=tcp:127.0.0.1:9000 &

4. 查看Nginx错误日志定位问题 #

通过错误日志获取404具体原因：

tail -f /var/log/nginx/error.log

内容的提问来源于stack exchange，提问作者LiteWait