[iOS9 UIAutomation] What is Appium approach to UIAutomation deprecation by Apple

Could not connect to lockdownd
I have see an error like this with Appium 1.5.3 also. Seems like a file permission problem for ideviceinstaller.
Changing the file permission (sudo chmod -R 777 /var/db/lockdown/) as suggested in this thread ideviceinstaller fails with "Could not connect to lockdownd. Exiting." · Issue #48 · libimobiledevice/ideviceinstaller · GitHub worked for me but only as a tempaorary fix. As something changes it back and tests start failing again. I haven’t found a permanent fix yet. This has only been a problem for us on one of our automation macs.

There seem to be a few different problems with lockdownd so maybe try installing you app manually using ideviceinstaller and inspect the message for the error code in case yours is a different problem

ideviceinstaller -u yourUDID -i path/to/your/app