Why does TCP test fast but UDP voice/gaming fail?
TCP retransmits and adapts, masking some loss; real-time UDP often cannot recover late/lost packets. Measure loss, jitter and path-specific filtering.
Protocol; loss/jitter; MTU; firewall; NAT.
Network engineering.
Show the technical detail
On a managed Wi-Fi plan
Layered wired/Wi‑Fi/WAN testing with timestamps.
On another provider's router
ISP and application provider may both need evidence.
What to be careful of
Do not infer UDP blocking from one app.
Where this comes from: Official · see the original source ↗ · Draft—technical review · checked 17 August 2026