A STALE Linux neighbour entry is different from FAILED
Neighbour table states describe local link address resolution. STALE is not a verdict that a remote streaming service is offline.
The journal
The viewing journal — page 57
Practical reading about streaming, devices and the decisions behind a better prepared setup.
A gigabit Ethernet adapter can be running at a lower link speed
Read the current Ethernet settings separately from the list of supported modes. Neither figure is an end to end streaming throughput measurement.
A saved Linux network profile is not necessarily active
NetworkManager can store several connection profiles. Use the active view when checking which configuration is currently applied.
Why a Linux wireless unblock can leave the radio unavailable
A hard wireless block can remain after a software unblock. Inspect the block state and the actual hardware control before retrying network credentials.
A Linux LISTEN socket does not prove another device can connect
A listening socket describes a local application state. Its address binding and the path from the other device still matter.
Why tracepath can say reached while a web player still fails
A tracepath result concerns its own network probes. Reaching a destination through that mechanism does not establish a successful web media request.