In some instances installers have been unable to join the Connect+ Installer with the Connect+ Panel. From Connect+ you may receive an unable to join or timeout error message. The following steps should eliminate these problematic errors. After each step attempt to join your device with panel again.
If you are receiving a NAK_Auth_Failure message see this article here
-Close app from multitasking. Double tap the Home Button and swipe up on the application.
-Turn bluetooth off and back on
-Move away from the customers WiFi router and any computer with USB 3.0 ports.
-Complete power cycle of your iOS device
-Power cycle Connect+ panel.
-Delete Connect+ Installer from your device and download again from the App Store.
-Ensure the Apple device is on the latest software version. Go to Settings app>General>Software Update
-Test with a known good bluetooth device or test with another iOS device
-Factory default Connect+. This will remove any previously configured zones and settings from the panel. If the panel already has a large configuration set up it may be wise to access the dealer portal using Safari or another web browser on your iOS device or another computer.