My Time Capsule cannot be mounted for backups, and the Time Capsule does not appear at all in AirPort Utility. However I can see and connect to its WiFi just fine. The truly odd thing is that I can connect to it using "Configure other..." in AirPort Utility, and see all of its configuration and backup drive.
Some screenshots follow. First, this is what I see in Airport Utility:
If I hit forget, I get this:
Note that the globe and the nice little green dot and "Internet" is my WiFi connection through the Time Capsule that is not there!
Clicking on "Other Wi-Fi Devices" shows no devices discovered.
If I click on the globe, I see the local IP address for the router, 10.0.1.1:
Now I do "Configure Other..." from the File menu, enter the router address 10.0.1.1, and the Time Capsule password. I get the full configuration of my otherwise invisible Time Capsule!
All of the tabs show the correct configuration. But I still can't connect to the very Time Capsule that I am connected to the internet through!
I have tried power cycling the Time Capsule and computer, and doing a soft and hard reset of the Time Capsule, reloading the configuration from a saved file (using Import and Export Configuration File). I end up right back in the same place.
Does this ring any bells for anyone here?