31903: Stream - WebSocket - Connection Broken Pipe

Twilio returns this error when a Media Stream WebSocket connection is abruptly closed by the server while the Stream is active. Media Streams use a WebSocket connection to stream call audio to your application, and Twilio must be able to reach your server over a secure WebSocket connection.

• Your WebSocket server is down or restarted while the Stream is still active.
• Your WebSocket server encountered an application or infrastructure problem that caused it to close the connection unexpectedly.
• The connection between Twilio and your WebSocket server was lost.
• A firewall, proxy, load balancer, or other intermediate network element interrupted traffic between Twilio and your WebSocket server.

• Verify that your WebSocket server process is running and stays available for the full duration of the Stream.
• Review your server logs for crashes, restarts, unhandled exceptions, or connection close events that line up with the failed Stream.
• Confirm that your Media Stream endpoint accepts secure WebSocket connections over wss and that Twilio can reach it on TCP port 443.
• Review your firewalls, proxies, and load balancers for idle timeouts, resets, or routing issues that can close the TCP socket before the Stream ends.
• If you are using bidirectional Media Streams, make sure your application closes the connection intentionally only when you want to stop the Stream or end the call.

• Media Streams overview
• <Stream> TwiML reference
• Media Streams network configuration