31910: Stream - WebSocket - SSL Protocol Error

This error occurs when Twilio can't establish the secure WebSocket connection required for Media Streams. <Stream> supports only wss, so your WebSocket endpoint must accept a secure connection before Twilio can begin streaming audio.

• The <Stream> url points to an endpoint that does not support wss.
• The WebSocket server is listening on the wrong port, or the port in the <Stream> url is not configured for TLS.
• The server certificate is not valid or is not accepted by standard HTTP clients, so the SSL handshake fails.
• A firewall or proxy is blocking secure WebSocket traffic to your public endpoint on port 443.

• Update the <Stream> url to use a reachable wss endpoint. Do not use ws.
• Configure your WebSocket server to accept secure connections on the port referenced in the <Stream> url. Media Streams requires secure WebSocket connectivity on port 443.
• Install or correct the TLS certificate so the endpoint presents a valid certificate that standard HTTP clients accept.
• Update your firewall or proxy rules to allow secure WebSocket connections from Twilio to your WebSocket server.

• Media Streams Overview
• TwiML Voice: <Stream>
• Media Streams Configuration