S2 App fails to start after installing on Win 10 OS.

Really? I thought the whole point of it was to intercept network access and scan executables as they load, looking for bad things. If that can’t affect sonos.exe then what use is it? At minimum it must install its own firewall, and that can certainly affect win32 apps like Sonos.

Of course Norton is aware of sonos.exe but in my years of Norton use I have never seen it interfere with the WDCR. It recognises the signature and trusts it. Nor, for that matter, has it ever blocked the installer.

I’ve encountered several cases over the past years where Norton affected the use of the Windows controller.

YMMV clearly.

Yeah, it comes up occasionally on here and Reddit. Writing kernel filter drivers that block bad things and allow good things, totally reliably, is hard. I used to work for Dr Solomon’s years ago, one of the early anti-virus companies. Fun times.

Solved !   Some what dramatically.  I reinstalled a fresh copy of Windows 10  as I keep only the OS and Applications on my solid state C: drive it did not take too long.  As soon as this was done I installed the Sonos 2 App with only Microsoft Defender for protection. It was like a different beast … It requested fire wall permission and setting  which the faulting installation had not during the install.  It then ran perfectly and is now working better that my old Sonos 1 set up.  I have reinstalled my preferred AV, BitDefender and all continues to run well. 

Thanks for you  for your engagement all the same,

Mark

PS Just need to reconfigure all my other apps now, that will take a day.    

Great! So no Norton involved in the Windows refresh, right?

No Norton !   Just Microsoft Defender on a virgin install of Windows 10 64bit  20H2  19042.610. 

BitDefender AV now installed and Sonos still running nicely. 

I have been using Windows Defender and Firewall since the introduction of Windows 8.1, for me the most trustworthy protection against malware, viruses, worms and other vermin.

Nothing wrong with Windows Defender … It is just that Bitdefender is a bit better. Sometimes a bit too much better  but at least it usually tells you when it is blocking  or that you have risky browsing, for sure it has stopped more than Windows Defender.  Only complaint is their marketing is a bit pushy.   

In Windows Defenders defence I would say it is better behaved than Bitdefender   when making new installs, perhaps it is a little more aware of installs ???