10060: A connection attempt fail

2021/03/27 13:39:52 [error] 8348#12812: *31 connect() failed (10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 117.176.126.128, server: 192.168.15.42, request: "POST /api/auth/user/token HTTP/1.1", upstream: "http://221.237.186.26:8763/api/auth/user/token", host: "221.237.186.26:8104", referrer: "http://221.237.186.26:8104/login"
2021/03/27 13:40:11 [error] 8348#12812: *32 connect() failed (10060: A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond) while connecting to upstream, client: 117.176.126.128, server: 192.168.15.42, request: "GET /api/auth/user/tokenByDingTalk?code=6629ddea6c3e3bf7925044014c524675&state=bind HTTP/1.1", upstream: "http://221.237.186.26:8763/api/auth/user/tokenByDingTalk?code=6629ddea6c3e3bf7925044014c524675&state=bind", host: "221.237.186.26:8104", referrer: "http://221.237.186.26:8104/login"

nginx.conf配置

server {
        listen       8182;
        server_name  localhost;
        
        location / {
            root   html;
            index  index.html index.htm;
        }
        location /upload/ {
            alias d:/upload/;
        }
    }
    server{
        listen 8104;
        server_name 192.168.15.41;
        fastcgi_buffers 8 256k; 
        send_timeout 60;
        location / {
           root   gmc-client;
           index  index.html index.htm;
           try_files $uri $uri/ /index.html;
        }
        location /api/ {
            proxy_pass http://localhost:8763/api/;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header Host $host;
        }
        #扫码登陆
        location /connect {
            proxy_pass https://oapi.dingtalk.com/connect;
            proxy_set_header Host oapi.dingtalk.com;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        }
        #imap
        location /iMap/iMapServer/{
            proxy_pass http://www.scgis.net.cn/iMap/iMapServer/;
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            proxy_set_header Host $host;
        }
    }

解决方法

将localhost改为127.0.0.1