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NT Fibre - connection failures 3 days running?

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I notice NT Fiber - connection failures 3 days running? Not sure what is going on. Happened on Wed, Thu and Fri this week and lost internet for approx 5 minutes each time. Strangely only seemed to lose internet on Windows PCs (multiple) whereas Android devices on same Wifi carried on working, maybe using some cache not sure.

Anyone else? Having these 5 minute blackouts seems odd. Not sure what is happening. All good again after 5 minutes or so.

  • Author

Yes, this is a known Windows 11 issue introduced by the March 2026 cumulative update (KB5079473). Many users report intermittent “no internet” symptoms where apps like YouTube continue streaming but browsers and Microsoft services drop for several minutes. Microsoft has already released an emergency patch (KB5085516) to fix it.

  • Author

Ignore the above as the emergency patch does not work and is a known issue with Microshaft. Only option is to roll back to Feb 2026 cummulative updates, which for most is not possible after 10 days, do a Win11 ISO repair install or live with internet outage until April patch comes out if that ever works. Copilot can create a bat file to reestablish an internet outtage when it happens, otherwise just waiting 10 minutes reconnects itself.

Root Cause

- Network Location Awareness (NLA) + Windows authentication stack:

KB5079473 changed how Windows 11 validates “internet connectivity.” When it misfires, Windows reports no internet and blocks new connections, even though the Wi‑Fi link is fine.

- Persistent vs. new connections:

Apps like YouTube keep streaming because they already have an open TCP session. Browsers and Microsoft services fail because they need to establish new connections, which the stack blocks.

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