Do you mean your firewall on your Mac or router? and where is SONOS approved in your firewall.

Sorry- On the MAC.  

I have reset controller, and all other devices with no luck.

Try going into System Settings, Privacy & Security, Local Network and see if SONOS has permission.

Thanks Peter.  It is listed there as well!  My Iphone is working with SONOS by the way.

Peter- You must have Great Karma!  I turned off the local network and reconnected and now it is ok!  You are the MAN!  Thank you!

Hehe no problem, glad it worked 
Please mark my reply as “answered” 

I hate to sound stupid but I have never done that in here- where do I do that?  LOL

Peter was able to resolve my issue.

Issue Closed 12/14/2024.

Thanks again Peter.  Everything seems to be back to normal!  

I too have this issue after updating to Sequoia 15.2. 

Same message whether Firewall is on or off. (sonos is already enabled)

Tried local network but Sonos not there (the Sonos 1 controller is, but not Sonos 2) How do I add an application to the local network?

Thanks so much

 Peter_254 you absolute chuffing legend! I’ve been losing my mind with this issue! Thank you. :-)