Why won't Sonos library if Time Capsule is in Bridge mode

The quickest solution might be to run the Time Capsule in DCHP and NAT mode if this allows the Sonos product to work correctly......AND.....you see no other ill effects from the Double NAT condition.

Apple does provide you with an option to "ignore" the Double NAT notice, which will allow the Time Caspules to display a green light instead of a bothersome blinking amber display. Sometimes.....although it might not be recommended by most networking guides.....you have to run a Double NAT on the network......it just depends.

However, if you do need to run the Time Capsule in Bridge Mode......you will need to remember an old network saying.......make one change on the network.....and everything else on the network will change.

So, once the Time Capsule is in Bridge Mode, you will have to start all over again and reset the Sonos product back to its original factory default condition and then set it up again so that the Sonos will work correctly with your new network settings.

If you call Apple Support on this issue, they will advise you run the Time Capsule in DHCP and NAT mode even though you have another router upstream on the network. Give them a call if you need to confirm this.

Among the things that a Double NAT can cause on a network.......

Slower Internet browsing

Some sites will load, while some may not

Interactive gaming consoles will not work correctly with Double NAT

Apple's Back to My Mac feature will not usually work with a Double NAT

Chances are, if you have been running the Double NAT on the network in the past and you have not noticed any issues, then things will probably continue to be OK.

"so could you tell me why the Sonos can't find the library on the TC drive (in Bridge mode) when it's plugged directly into the back of the TC?"

The Sonos device learned the actual location and network address of the TC when it was set up in Double NAT. If you set up the TC in Bridge Mode, it will have a new, different address on the network......that the Sonos does not know about, since it has not been programmed to find the TC at the "new" location.

That is why I said that if you need to set up the TC in Bridge Mode.......you will need to reset the Sonus device back to its original settings and then set it up again so that it can learn the new location of the TC on the network.

By network "location", I mean boring stuff like IP addresses, etc.

If you are saying that the Sonus is now working correctly with the Time Capsule in Bridge Mode, then obviously there is no need to reset the Sonus back to factory defaults and start all over again.

The library is going to have a tendency to get "lost" with the Time Capsule in Bridge Mode, so you may need to check the preference settings from time to time.

If you are saying that the Sonus is still not working after you changed the preference settings, then it you will need to start all over again from scratch and reset the Sonus back to its original default settings and then set it up again.

As I said......assuming the TC is now is in Bridge Mode......

If you are saying that the Sonus is still not working after you changed the preference settings, then it you will need to start all over again from scratch and reset the Sonus back to its original default settings and then set it up again.

Note......there is no guarantee that the Sonus will operate correctly with the TC in Bridge Mode. It should....but "should" is not the same thing as saying "will". And, in networking if you change one thing.....other things that were working before will change.

Double NAT is not necessarily a bad thing in and of itself, unless it is creating problems on the network.....it is simply a different option to set things up. As I mentioned above.....if you call Apple Support, they will first recommend that you run the Double NAT. Might be something to consider.

If you are bothered by the blinking amber light, there is way to tell the TC to display a green light when it is in Double NAT.