Did you reboot all the Sonos units, by powering off for 30 seconds? 

Windows defaults new wifi networks to “public”, which is not compatible with Sonos. Switch your wifi to “Private”.

Why Sonos engineers don’t add a specific error message for this remains a mystery.

That’s interesting. I’ve used the Windows controller for years on machines (W8.1, W11) with the interface set to “public”. 

No idea how you get away with that, unless you have done additional manual configuration. It’s actually dangerous, as it means if you are on a Starbucks wifi (which is public), others can access your machine on the network.

https://www.howtogeek.com/245982/whats-the-difference-between-private-and-public-networks-in-windows/

I’ve even seen a few Ethernet connections end up as public, and blocking Sonos.

Dangerous? It’s the other way round surely. If set to “public” Windows is not discoverable. It’s for “public networks”. In any case it’s the default (and “recommended”) in W11.

Mine in an Ethernet desktop. I don’t share anything onto the private subnet. Sonos WDCR has always worked fine. The Windows firewall is however disabled as I’m using Norton.

No, but I tried now. It didn’t help.

Thanks

Thank you. It was the correct answer. Connected immediately afterwards. I was using Ethernet though, but same issue.

/Joey

Excellent! Now its working you can try my Windows app (see profile) for free for 30 days. (And yes, my app does have a specific error message for this).