What are common troubleshooting steps for WebSocket connection failures with Cloudflare?

When WebSockets fail with Cloudflare, common troubleshooting steps include: 1. **Verify Origin Server**: Ensure your origin server is correctly configured to handle WebSocket `Upgrade` requests (e.g., Nginx, Apache, Node.js applications). Check server logs for errors. 2. **Bypass Cloudflare**: Temporarily point your DNS directly to the origin IP or use a different domain not proxied by Cloudflare to confirm if the issue is Cloudflare-related. 3. **Cloudflare Rules**: Review Cloudflare Page Rules, Firewall Rules, and Security settings to ensure no rules are inadvertently blocking or modifying WebSocket traffic. 4. **Caching**: Ensure WebSocket endpoints are not being cached, as this can interfere with persistent connections. 5. **Timeouts**: While Cloudflare generally supports long-lived connections, ensure your origin server's timeouts are also sufficiently long (e.g., `proxy_read_timeout` in Nginx).