Could not check origin for Phoenix.Socket transport

Im receiving this error when try to deploy to digital ocean as production(Please don’t ask to use gigalixir / fly as this is client requirement). However I got error and websocket isnt working. Im using apache on ubuntu 22 LTS. I already made a search online, however no luck with my issue. Any response is highly appreciated. Thanks

Here is the error

15:14:14.623 [error] Could not check origin for Phoenix.Socket transport.

Origin of the request:

This happens when you are attempting a socket connection to
a different host than the one configured in your config/
files. For example, in development the host is configured
to "localhost" but you may be trying to access it from
"". To fix this issue, you may either:

1. update [url: [host: ...]] to your actual host in the
     config file for your current environment (recommended)

  2. pass the :check_origin option when configuring your
     endpoint or when configuring the transport in your
     UserSocket module, explicitly outlining which origins
     are allowed:

        check_origin: ["",
                       "//", "//"]

Here is my configuration file for prod.secret.exs

use Config

config :th, Th.Repo,
  username: "user",
  password: "password",
  hostname: "localhost",
  database: "th",
  pool_size: 10

config :th, ThWeb.Endpoint,
  server: true,
  http: [port: 4000, transport_options: [socket_opts: [:inet6]]],
  check_origin: [

  secret_key_base: "SECRET",

Here is my apache configuration

	ServerAdmin webmaster@localhost
        DocumentRoot /var/www/html

        # Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
        # error, crit, alert, emerg.
        # It is also possible to configure the loglevel for particular
        # modules, e.g.
        #LogLevel info ssl:warn

        ErrorLog ${APACHE_LOG_DIR}/error.log
        CustomLog ${APACHE_LOG_DIR}/access.log combined

        LoadModule proxy_module modules/
        ProxyRequests Off
        ProxyPreserveHost On
        #ProxyPass "/" "ws://localhost:4000/" retry=0 timeout=5
        #ProxyPassReverse "/" "ws://localhost:4000/" my_app.tld
        ProxyPass "/" "" timeout=10
        ProxyPassReverse "/" ""

Anything I missing here?

same error for me so if u found a solution now would be a good time to post

Hi Sir, Sorry, I did not find any solution for it. I just redeploy on new server using nginx