Mobile Apps cannot connect

I have been searching for a while and found some posts that had a similar problem, but nothing helped to fix my problem.

My server is running on (Let’s Encrypt, Apache reverse proxy). Desktop apps and server work perfectly. Android app can load messages, but not send. There’s a “Connecting in …” countdown, which keeps getting higher. iOS won’t connect at all.

Am I missing some configuration?

Thx for any advice!

Edit: Android v2.4.0, iOS v3.0.1, Server v0.66.2

This message appears because your server do not support WebSockets, take a look:

curl -i -N -H "Connection: Upgrade" -H "Upgrade: websocket" -H "Host:" -H "Origin:" -H "Sec-WebSocket-Key: fVXESE8fjBMx8HheW0YlZQ==" -H "Sec-WebSocket-Version: 13"

HTTP/1.1 500 Internal Server Error
Date: Fri, 20 Jul 2018 14:22:27 GMT
Server: Apache/2.4.18 (Ubuntu)
Content-Length: 612
Connection: close
Content-Type: text/html; charset=iso-8859-1

<title>500 Internal Server Error</title>
<h1>Internal Server Error</h1>
<p>The server encountered an internal error or
misconfiguration and was unable to complete
your request.</p>
<p>Please contact the server administrator at to inform them of the time this error occurred,
 and the actions you performed just before this error.</p>
<p>More information about this error may be available
in the server error log.</p>
<address>Apache/2.4.18 (Ubuntu) Server at Port 443</address>

Ok thanks, didn’t realize that. Where would I get started to enable this?

Since you’re using Apache, you can start here:

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I had already set it up with this guide, but doing it again resolved the issue (somehow).

Thank you very much!

Awesome, glad it worked! :heart:

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Sorry to bump this thread, but this may be in the interest of anyone else searching Google.

I am having the same as OP however I installed my server via the Ubuntu snap using these instructions. Since this seems to be the most suggested/easiest way to install the app. I was also sure to configure SSL and Caddy.

I have this error in my console:

WebSocket connection to 'wss://' failed: Error during WebSocket handshake: Unexpected response code: 400

Disabling Cloudflare will change the error to:

WebSocket connection to 'wss://' failed: Error in connection establishment: net::ERR_CERT_COMMON_NAME_INVALID

So, the Ubuntu snap instructions by default leave me with a server that cannot use mobile apps and some other external services. It also produced this nginx server config:

 listen 443 ssl;
 ssl_certificate /etc/letsencrypt/live/;
 ssl_certificate_key /etc/letsencrypt/live/;
 ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
 root /usr/share/nginx/html;
 index index.html index.htm;
# Make site accessible from http://localhost/
 server_name localhost;
 location / {
 proxy_pass http://localhost:3000/;
 proxy_http_version 1.1;
 proxy_set_header Upgrade $http_upgrade;
 proxy_set_header Connection “upgrade”;
 proxy_set_header Host $http_host;
 proxy_set_header X-Real-IP $remote_addr;
 proxy_set_header X-Forward-For $proxy_add_x_forwarded_for;
 proxy_set_header X-Forward-Proto http;
 proxy_set_header X-Nginx-Proxy true;
 proxy_redirect off;
server {
 listen 80;
 return 301 https://$host$request_uri;

This is a reverse proxy, yeah? Perhaps this is caused by the CERT error above, or maybe some extra config is missing?