Bad Gateway 502 error - Nginx Flask Python Confirguration

  • Posted March 7, 2018
  • Nginx

I am attempting to configure Nginx to run my flask/python application on a Linux Centos 7 server. I am getting a Bad Gateway 502 error. I am new to using Nginx so I am hoping I am going the right direction. Here are my files. Error message [error] 91680#0: *23 connect() to unix:/var/www/MyApp/MyApp.sock failed (111: Connection refused) while connecting to upstream, client:, server: _, request: “GET /favicon.ico HTTP/1.1”, upstream: “uwsgi://unix:/var/www/MyApp/MyApp.sock:”, host: “”, referrer: “http://ip.address/MyApp/


[uwsgi] module = wsgi

master = true processes = 5


[uwsgi] module = wsgi

master = true processes = 5

socket = MyApp.sock chmod-socket = 664 vacuum = true

die-on-term = true


server { listen 8000; server_name;

location / { include uwsgi_params; uwsgi_pass unix:/var/www/MyApp/MyApp.sock; } }

server { listen 80 default_server; listen [::]:80 default_server; server_name _; root /var/www/MyApp; }

location / { uwsgi_pass unix:/var/www/myapp/MyApp/MyApp.sock; uwsgi_param UWSGI_TOUCH_RELOAD /var/www/MyApp/MyApp.sock; include uwsgi_params;


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This error means that nginx is unable to connect to uWSGI through the socket. This can happen in one of two cases:

  1. uWSGI isn’t running
  2. the socket path is not correct

Your config files looks fine, so I’m guessing it’s 1. Is uWSGI running? You can check by running this command and seeing if it outputs anything:

sudo ps wwaux | grep -i uwsgi