85% confidence\u2191 16
could not establish connection to WebSocket
Full error message
WebSocket connection to 'wss://example.com/ws' failed
Solution
WS handshake did not complete. 1. Reverse proxy must upgrade the connection: nginx `proxy_set_header Upgrade $http_upgrade; proxy_set_header Connection "upgrade"; proxy_http_version 1.1;`. 2. Cloudflare: WebSockets are supported on all plans but orange-cloud must be on. 3. TLS: wss:// requires a valid cert on the hostname. 4. Server actually listens — test with `wscat -c wss://example.com/ws`.
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