'Websocket connection failure error' on test domain

We have a web socket that cannot connect to the server (test.private-socket.domain.io). But we have a different one: private-socket.domain.io that works properly.

I think we have some issue in the Cloudflare configuration, particularly in the DNS section? But we tried all the recommended changes and followed the CF guide (https://support.cloudflare.com/hc/en-us/articles/200169466-Using-Cloudflare-with-WebSockets) and still end up with a web socket error. Please let me know what other info I can share that would help, thank you! :slight_smile:

If you are trying to use Cloudflare SSL for the test.private-socket.domain.io it won’t work as Cloudflare only covers private-socket.domain.io and you need ACM for it.