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What could cause the errSecNotAvailable error (-25291) to be returned from a keychain write? I see from the documentation "No trust results are available," [1]. Is that something that can be remedied on a retry of the same keychain query, is there some action that can be taken to fix the error programmatically, or does the user have to do something on the device to fix this? I see one comment indicating the device would need to be restarted [2].[1] https://developer.apple.com/library/ios/documentation/Security/Reference/keychainservices/#//apple_ref/c/econst/errSecNotAvailable[2] http://fossies.org/linux/fpcbuild/fpcsrc/packages/univint/src/SecBase.pas