Network Preflight for a Live 4All Event

Validate DNS, HTTPS, secure WebSockets, latency, loss, bandwidth, proxies, and backup connectivity.

Written By 4ALL.LIVE

Last updated About 1 month ago

Prove the venue network can sustain all operator, caption, translation, ASL, viewer, and desktop output paths.

Best for: Network engineers, production IT, and lead operators.

Before you start

Network/security changes require authorization from the venue or organization.

  • Use a non-production reproduction when possible.
  • Record current configuration before changes.
  • Keep an independent confidence monitor and fallback.
  • Inventory operator, interpreter, desktop app, viewer, and receiver locations.
  • Estimate concurrent audio/video/viewer bandwidth plus headroom.
  • Know proxy, SSL inspection, captive portal, VLAN, and firewall ownership.

Step by step

  1. Use wired Ethernet for production sources and validate a physically independent backup.
  2. Confirm system DNS and HTTPS access to the 4All application, help/status, authentication, assets, and approved provider endpoints.
  3. Run 4All Preflight and require the Transcript v3 secure WebSocket hello/ping/pong check to pass.
  4. Test remote-control, display, ASL/LiveKit, translation/STT provider, XPression, and Encoder paths actually used.
  5. Measure sustained upload/download, round-trip time, jitter, and packet loss under realistic venue load.
  6. Verify proxies and TLS inspection preserve long-lived wss:// connections and do not rewrite media traffic.
  7. Document allowed outbound TCP 443 and every local/LAN protocol port for desktop integrations; SRT/RIST normally use agreed UDP ports.
  8. Fail over to backup connectivity in rehearsal and verify recovery order.

What success looks like: Every required production path passes under load with a tested backup and named network owner.

Check your setup

  • Preflight realtime WebSocket passes.
  • No captive portal/idle timeout appears.
  • Bandwidth headroom remains.
  • Receiver-side monitoring survives the planned topology.

Troubleshooting

  • HTTPS works/WSS fails: inspect proxy/firewall idle timeout and upgrade handling.
  • High jitter/loss: use wired path or engineered contribution protocol.
  • Works on hotspot: venue network policy is likely the cause.
  • Local desktop port blocked: create least-scope host/firewall rule.

Security and operational notes

Important: Do not publish a universal allow-list without confirming the current deployment and providers. Validate exact production endpoints with 4All support/IT.