Hi Kenneth,
Please see our Q and A:
http://mobilinc.com/support/commonquestions/"I'm using iOS 9 and MobiLinc is unable to connect via a direct IP over HTTPS (externally) to my ISY."
Apple removed support in iOS 9 for older (insecure) ciphers/handshake methods in HTTPS. The supported handshake methods are TLS 1.0 and above.
In order to allow iOS 9 to handshake with the ISY over HTTPS, the ISY must be running firmware 4.2.30 or later and configured through the ISY Dashboard to support TLS 1.0 or above.
Please note that MobiLinc Connect users are not impacted by this change to iOS 9 as MobiLinc Connect and the ISY already support industry best practices for HTTPS communication and is compatible with iOS 9.