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

Question

With the help of code can i know What are the possible reasons for a WebSocket connection failing to establish

Answer 1

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.