locationManager:rangingBeaconsDidFailForRegion:withError: kCLErrorDomain 16

Question

I have read CLLocationManager kCLErrorDomain Codes? as well as Apple Docs

I check to make sure ranging is available before calling startRangingBeaconsInRegion: and I am

Answer 1

It seems that I started to face this issue after I updated my device to iOS 7.1 (iPhone 5S). rangingBeaconsDidFailForRegion: gets called with error.domain equal to @"kCLErrorDomain" and with error.code as kCLErrorRangingUnavailable (16) (even though Airplane mode is not on and Bluetooth is up and running).

I followed davidgyoung's advice to just boot (I did a hard boot pressing Home + Power until the device shuts down and displays the Apple logo, but also a normal boot works) the device, and now it seems to work correctly.

This appears to be a bug in iOS 7.1 and iOS 7.1.1, see here https://stackoverflow.com/a/22949187/1461050. The only workaround - for now - is to reboot the device.

Apple has now released iOS 7.1.2, which should fix this problem (awaiting for confirmation).