What are the possible reasons for a WebSocket connection failing to establish

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With the help of code can i know What are the possible reasons for a WebSocket connection failing to establish
Apr 1 in Node-js by Nidhi
• 16,020 points
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1 answer to this question.

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A WebSocket connection may fail due to:

  1. Incorrect URL – Using ws:// instead of wss:// for secure connections.

  2. Server Issues – WebSocket server is down or not listening.

  3. Firewall/Network Restrictions – Proxy, firewall, or VPN blocking WebSocket traffic.

  4. CORS Policy – Server not allowing cross-origin WebSocket connections.

  5. Protocol Mismatch – Server and client using different WebSocket subprotocols.

  6. SSL/TLS Issues – Invalid or expired SSL certificate for wss:// connections.

  7. Browser Limitations – Some browsers block WebSockets in insecure contexts.

answered Apr 3 by anonymous

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