Question 97135 in Nginx Question posted in
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Plex behind NGINX reverse proxy: "Request came in with unrecognized domain / IP 'plex.mydomain.com' in header Host; treating as non-local

I’m running the latest version of Plex Media Server: Version 1.31.2.6810. Under my Plex server’s Network settings, I specified my custom domain names:

Custom server access URLs: https://plex.mydomain.com,https://mediaplex.mydomain.com

However, in Plex’s console log, I keep getting the below message; which I don’t my plex clients to be treated as ‘non-local’

"Request came in with unrecognized domain / IP ‘plex.mydomain.com’ in header Referer; treating as non-local"

I tried using the NGINX config from this Gist Github post and this Gist Github post2; which specifically was meant to handle this issue (at least for an older version of Plex Server). However, it didn’t make any difference.
What am I missing in this configuration?

PS: I have the below setting enabled under Plex’s network settings. I’m not sure if this would cause the issue I’m seeing or not.

☑️ Treat WAN IP As LAN Bandwidth

nginx.conf

server {
        listen 443 ssl http2; 
        listen [::]:443 ssl http2;
        ssl_certificate     ./ssl/fullchain.cer;
        ssl_certificate_key ./ssl/cert.key;
        ssl_prefer_server_ciphers on;
        server_name  plex.mydomain.com mediaplex.mydomain.com;
        client_max_body_size 0;
        set $plex http://127.0.0.1:32400;
        gzip on;
        gzip_vary on;
        gzip_min_length 1000;
        gzip_proxied any;
        gzip_types text/plain text/css text/xml application/xml text/javascript application/x-javascript image/svg+xml;
        gzip_disable "MSIE [1-6].";

        # Forward real ip and host to Plex
        proxy_set_header Host $host;
        proxy_set_header Referer $host;
        proxy_set_header Origin $host;
        proxy_set_header X-Real-IP $remote_addr;
        #When using ngx_http_realip_module change $proxy_add_x_forwarded_for to '$http_x_forwarded_for,$realip_remote_addr'
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Plex-Client-Identifier $http_x_plex_client_identifier;
        proxy_set_header X-Plex-Device $http_x_plex_device;
        proxy_set_header X-Plex-Device-Name $http_x_plex_device_name;
        proxy_set_header X-Plex-Platform $http_x_plex_platform;
        proxy_set_header X-Plex-Platform-Version $http_x_plex_platform_version;
        proxy_set_header X-Plex-Product $http_x_plex_product;
        proxy_set_header X-Plex-Token $http_x_plex_token;
        proxy_set_header X-Plex-Version $http_x_plex_version;
        proxy_set_header X-Plex-Nocache $http_x_plex_nocache;
        proxy_set_header X-Plex-Provides $http_x_plex_provides;
        proxy_set_header X-Plex-Device-Vendor $http_x_plex_device_vendor;
        proxy_set_header X-Plex-Model $http_x_plex_model;
        proxy_set_header Cookie $http_cookie;
        proxy_set_header Sec-WebSocket-Extensions $http_sec_websocket_extensions;
        proxy_set_header Sec-WebSocket-Key $http_sec_websocket_key;
        proxy_set_header Sec-WebSocket-Version $http_sec_websocket_version;

        # Websockets
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "Upgrade";

        # Buffering off send to the client as soon as the data is received from Plex.
        proxy_redirect off;
        proxy_buffering off;

        location / {
            # if a request to / comes in, 301 redirect to the main plex page.
            # but only if it doesn't contain the X-Plex-Device-Name header
            # this fixes a bug where you get permission issues when accessing the web dashboard
            # Redirect if not an options request.
            if ($request_method != OPTIONS ) {
                    set $test A;
            }
            if ($http_x_plex_device_name = '') {
                    set $test "${test}B";
            }
            if ($arg_X-Plex-Device-Name = '') {
                    set $test "${test}C";
            }
            if ($test = ABC) {
                    rewrite ^/$ https://$http_host/web/index.html;
            }
            proxy_pass $plex;
        }
}
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2

Answers


  1. 0

    As you said that 192.168.1.2 works well for you. You can pass it to the plex. So in your nginx config file replace

    proxy_set_header Host $host;
proxy_set_header Referer $host;
proxy_set_header Origin $host;

    with:

    proxy_set_header Host 192.168.1.2;
proxy_set_header Referer https://192.168.1.2:32400;
proxy_set_header Origin 192.168.1.2;
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  2. 0

    As per your questions the error message says:

    "Request came in with unrecognized domain / IP ‘plex.mydomain.com’ in
    header Referer; treating as non-local"

    In your nginx config you are explicitly passing the $host variable to this header.

    proxy_set_header Referer $host;

    From the Nginx docs here the host variable will hold:

    $host

    in this order of precedence: host name from the request line, or host name from the “Host” request header field, or the server name matching a request

    It would appear that the value being passed here does not match your configured domain names in the plex config.

    You could investigate the value by adding a location block and browsing to it.

        location = /showhost {
        default_type text/html;
        return 200 "Host: $host" ;
    }

    If this variable is not set to an appropriate value it might be to worth trying a different var for example $host_name

    You could just explicitly pass localhost or one of your configured server names as the header value.

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