Webscoket + SSL + Cloudflare Protection

Hello i google it but i find nothink …

12:32:09 system: Connecting to wss://domain.com:9095/
No protocol negotiation.
12:32:52 error: WebSocket error.
12:32:52 system: Connection closed.
Close status: 1006 (Abnormal Closure)

i Get this message wen i enable protection Cloudflare
Websocket works with protection?

Cloudflare only proxies specific ports and I don’t believe 9095 is one of them. Here’s a list of allowed ports:


Hi @cs-cf,

I am using Cloudflare Flexible SSL but temporarily disabling the Always Use HTTPS setting for testing purposes.

I am trying to implement websocket via port 8080 using Socket.io on my app but I cannot make it to work over HTTPS. It is fine when I am viewing the app over HTTP whereby the clients are able to connect to the socket server.

FYI, the client app resides in a subdomain such as http://sub.domain.com while the NodeJS socket server resides at http://domain.com:8080.

On HTTPS mode however, the console output ERR_SSL_PROTOCOL_ERROR when the clients are trying to connect to the socket server. I read somewhere on the Cloudflare forum a guy suggested to set a Page Rule to disable SSL on the URL you are using to call the socket server such as (asterisk)domain.com:8080/(asterisk). I have tried this and it still doesn’t work.

It is vital for the web app to work in HTTPS.

Can you advise how to set this up properly?

Thank you.

Port 8080 is a HTTP only port, won’t work with HTTPS. You need to use one of the HTTPS port listed on the article posted above.

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Hi @matteo,

I tried with port 8443 but I got a different error now.

Access to XMLHttpRequest at ‘https://domain.com:8443/socket.io/?EIO=3&transport=polling&t=MUWAhNu’ from origin ‘https://domain.com’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

Tried doing this at the NodeJS server but no dice.

const server = require('http').createServer(function(request, response) {
    response.setHeader('Access-Control-Allow-Origin', '*');
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