I am building a website using Django, Nginx and Gunicorn. Everything worked perfectly fine for months, until today after I restarted nginx service, my website gives my 502 bad gateway.

root@xxx:/# nginx -t
nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

Here is the error log (my website is in PRODUCTION):

root@xxx:/# cat /var/log/nginx/error.log

2019/06/05 11:53:44 [error] 1577#1577: *3 connect() to unix:/home/xxx/xxx/xxx.sock failed (111: Connection refused) while connecting to upstream, client: xxx.xxx.xxx.xxx, server: xxx.net, request: "GET / HTTP/1.1", upstream: "http://unix:/xxx/xxx/xxx/xxx.sock:/", host: "xxx.net"

Here is the conf:

root@vps675614:/# cat /etc/nginx/sites-enabled/xxx 
server {
    server_name xxx.net;

    location = /favicon.ico { access_log off; log_not_found off; }

    location / {
        include proxy_params;
        proxy_pass http://unix:/xxx/xxx/xxx/xxx.sock;

    location /static/ {
       alias /xxx/xxx/xxx/static/;

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/xxx.net/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/xxx.net/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot

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

    listen 80;
    server_name xxx.net;
    return 404; # managed by Certbot


Server: Ubuntu 18.04 LTS

  • Your configuration looks odd. It is not usual that one uses proxy_pass to a unix domain socket. How exactly is your application server configured? – Tero Kilkanen Jun 5 at 20:05
  • I am a newbie so I can't really answer you. What do you want to know exactly ? – qux Jun 7 at 19:29

Based on http://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_pass, the path for the unix socket has to be fully enclosed by two colons, so your proxy_pass line should look like:

proxy_pass http://unix:/xxx/xxx/xxx/xxx.sock:/;

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.