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ActionCable doesn't work in production. Works well in development, but not in production.

Running Nginx with Puma on Ubuntu 14.04. I have checked that redis-server is up and running.

Rails -v 5.0.0.1

production.log :

INFO -- : Started GET "/cable/"[non-WebSocket] for 178.213.184.193 at 2016-11-25 14:55:39 +0100
ERROR -- : Failed to upgrade to WebSocket (REQUEST_METHOD: GET, HTTP_CONNECTION: close, HTTP_UPGRADE: )
INFO -- : Finished "/cable/"[non-WebSocket] for 178.213.184.193 at 2016-11-25 14:55:39 +0100
Request from client:
GET ws://mityakoval.com/cable HTTP/1.1
Host: mityakoval.com
Connection: Upgrade
Pragma: no-cache
Cache-Control: no-cache
Upgrade: websocket
Origin: http://mityakoval.com
Sec-WebSocket-Version: 13
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.98 Safari/537.36
Accept-Encoding: gzip, deflate, sdch
Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.6,en;q=0.4,uk;q=0.2,nb;q=0.2
Cookie: _vaktdagboka_session=******
Sec-WebSocket-Key: *******
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits
Sec-WebSocket-Protocol: actioncable-v1-json, actioncable-unsupported
Response: 
HTTP/1.1 404 Not Found
Server: nginx/1.4.6 (Ubuntu)
Date: Fri, 25 Nov 2016 13:52:21 GMT
Content-Type: text/plain
Transfer-Encoding: chunked
Connection: keep-alive
Cache-Control: no-cache
X-Request-Id: d6374238-69ef-476e-8fc5-e2f8bbb663de
X-Runtime: 0.002500
nginx.conf:
upstream puma {
  server unix:///home/mityakoval/apps/vaktdagboka/shared/tmp/sockets/vaktdagboka-puma.sock;
server {
  listen 80 default_server deferred;
  # server_name example.com;
  root /home/mityakoval/apps/vaktdagboka/current/public;
  access_log /home/mityakoval/apps/vaktdagboka/current/log/nginx.access.log;
  error_log /home/mityakoval/apps/vaktdagboka/current/log/nginx.error.log info;
  location ^~ /assets/ {
    gzip_static on;
    expires max;
    add_header Cache-Control public;
  try_files $uri/index.html $uri @puma;
  location @puma {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_redirect off;
    proxy_pass http://puma;
  location /cable {
    proxy_pass http://puma;
    proxy_http_version 1.1;
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    proxy_set_header Host $http_host;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "Upgrade";
  error_page 500 502 503 504 /500.html;
  client_max_body_size 10M;
  keepalive_timeout 10;
cable.yml:
redis: &redis
  adapter: redis
  url: redis://127.0.0.1:6379
production: *redis
development:
  adapter: async
test:
  adapter: async
in production.rb:
config.action_cable.allowed_request_origins = ["http://mityakoval.com"]
in routes.rb:
mount ActionCable.server, at: '/cable'
UPDATE:
Don't forget to restart nginx :) That was the problem for me.
                Just a heads up to others:  If your nginx is setup as a multi-site server, your configuration file will probably be /etc/nginx/sites-enabled/sitename instead of /etc/nginx/sites-available/default
– Dave Collins
                Jan 3, 2018 at 13:50
You should change the value of proxy_pass property from http://puma to http://puma/cable.
Therefore, the correct location section for the /cable will be:
location /cable {
  proxy_pass http://puma/cable;
  proxy_http_version 1.1;
  proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  proxy_set_header Host $http_host;
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "Upgrade";
While other posts have correctly posted solutions I thought I'd post a bit more info on how to identify where the problem is/where to fix it for other nginx noobs. 
You will know your nginx config needs the proxy_set_header Upgrade at the path you're mounting action cable if the rails error contains HTTP_UPGRADE:. (Meaning nothing is passed to HTTP_UPGRADE). After fixing the problem my logs are showing HTTP_UPGRADE: websocket
Gotchya 1: As mentioned by the op, make sure you restart nginx after making a change(I was incorrectly doing this). 
Gotchya 2: Also look for include statements in the nginx config as your config could be split across multiple files. The location /cable { section should be inside of server { which in my case was missing because it was in a different config file from an includes statement which I didn't notice for a while.
Similar error but different problem: Your rails logs will contain an additional error in the logs right before the one the OP mentioned saying the origin is not allowed, that is when your rails config needs to be updated as another answer mentions updating config.action_cable.allowed_request_origins.
The logging is subject to change with rails but hopefully this helps clarify where the problem and a few gotchya's I encountered as someone who knows nothing about nginx.
                Thanks in my case there was many server { block, I have placed it one which is listing at port 443 and it start working.
– Shoaib
                May 27, 2021 at 18:20
Super late to this conversation, however, for anyone who is facing the same error message using Rails5, Action Cable, etc. & DEVISE you simply solve it like suggested here. It all comes down to the web socket server not having a session, hence the error message.
app/channels/application_cable/connection.rb
module ApplicationCable
  class Connection < ActionCable::Connection::Base
    identified_by :current_user
    def connect
      self.current_user = find_verified_user
      logger.add_tags 'ActionCable', current_user.name
    protected
      def find_verified_user
        verified_user = User.find_by(id: cookies.signed['user.id'])
        if verified_user && cookies.signed['user.expires_at'] > Time.now
          verified_user
          reject_unauthorized_connection
app/config/initializers/warden_hooks.rb
Warden::Manager.after_set_user do |user,auth,opts|
  scope = opts[:scope]
  auth.cookies.signed["#{scope}.id"] = user.id
  auth.cookies.signed["#{scope}.expires_at"] = 30.minutes.from_now
Warden::Manager.before_logout do |user, auth, opts|
  scope = opts[:scope]
  auth.cookies.signed["#{scope}.id"] = nil
  auth.cookies.signed["#{scope}.expires_at"] = nil
Solution was developed by Greg Molnar
                @Micah, i am facing a similar issue on safari, did you manage to find more information about it?
– opensource-developer
                Jul 29, 2020 at 19:33
The resolution that needs a NGINX configuration changes to accept this action cable request.
location / {
  proxy_set_header Upgrade $http_upgrade;
  proxy_set_header Connection "upgrade";
Add the above lines to your location block in the nginx site configuration, then restart nginx.
My solution was to add these lines to my production.rb file:
  config.action_cable.url = 'ws://your_site.com/your_action_cable'
  config.action_cable.allowed_request_origins = [ 'http://your_site.com' ]
Then you should have this key set up in the environment, should look something like this:
REDIS_URL: 'redis://redistogo:keyblahblahblhblah'
Also, you should have this in production.rb:
config.web_socket_server_url = "wss://YOUR_URL.com/cable"
                Ah, okay, I got it. I don't use RedisToGo. Redis server is running on my production server. And I guess it should be ws://... instead of wss://... since I'm not using SSL.
– mityakoval
                Nov 26, 2016 at 13:48
        
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