Nginx 502 Bad Gateway DotNet App

Question

我正在使用 NopCommerce 4.60.5 和 Ubuntu 23，Nginx 作为上游 .net 应用程序的反向代理。网站已启动并运行，但存在一些小问题，我正在努力解决。但是，当我从管理员重新启动 nopCommerce 时，问题开始出现，当设置发生某些更改时，我收到 502 Bad Gateway 错误。nginx 错误日志显示，拒绝连接上游服务器。我有本地服务器和生产服务器，两者都有完全相同的问题。已经 7 天了，我搜索并尝试了几乎所有方法来解决此问题，但没有任何效果。这是我的配置..

server {

# include snippets/snakeoil.conf;



# Add index.php to the list if you are using PHP
index index.html index.htm index.nginx-debian.html;

server_name www.MYDOMAIN.ca MYDOMAIN.ca;

location / {
    # First attempt to serve request as file, then
    # as directory, then fall back to displaying a 404.
    #try_files $uri $uri/ =404;



proxy_pass         http://localhost:5000;
add_header 'Content-Security-Policy' 'upgrade-insecure-requests';
proxy_http_version    1.1;
proxy_set_header      Upgrade $http_upgrade;
proxy_set_header      Connection keep-alive;
proxy_set_header      Host $host;

#proxy_set_header X-Real-IP $remote_addr; proxy_cache_bypass $http_upgrade; #proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; #proxy_set_header X-Forwarded-Proto $scheme; #proxy_set_header X-Frame-Options SAMEORIGIN; #proxy_set_header X-Forwarded-Host $host; #proxy_read_timeout 900; }

listen [::]:443 ssl ipv6only=on; # managed by Certbot
listen 443 ssl; # managed by Certbot

server_name MYDOMAIN.ca www.MYDOMAIN.ca; ssl_certificate /etc/letsencrypt/live/supplysolution.ca/fullchain.pem; # 由 Certbot 管理 ssl_certificate_key /etc/letsencrypt/live/supplysolution.ca/privkey.pem; # 由 Certbot 管理 include /etc/letsencrypt/options-ssl-nginx.conf; # 由 Certbot 管理 ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # 由 Certbot 管理

} 服务器 { 如果 ($host =www.MYDOMAIN.ca）{return 301 https://$host$request_uri; } # 由 Certbot 管理

if ($host = MYDOMAIN.ca) {
   return 301 https://$host$request_uri;
} # managed by Certbot

listen 80;
listen [::]:80;

server_name MYDOMAIN.ca www.MYDOMAIN.ca;
return 404; # managed by Certbot

} 如果有人能帮助我解决过去 7 天一直存在的这个问题，我将不胜感激。