This issue is similar to “Sonos no longer finds NAS network path” but is S1, the library is very small and the ping to the router where the NAS is seems to be fast.
Router (Nighthawk R7000) has a small USB-HD connected as a network folder. All accesses with NO password.
My desktop (Windows 10) is able to connect as network location but Sonos S1 (from desktop or Android App) is not, that means, S1 is not able to add a music library as a network device.
The error is related to "Server stack" (error 900).
Like the other question, this was working fine for years and for months now Sonos no longer accesses the music library. No idea what could be changed in my system.
Think I have tried all net-basic things but no luck.
Need help. Any advise ?