Today I was testing an app on iOS9 simulator, and got an Error when connecting to Parse. After doing some research, I found that there is App Transport Security in iOS9.
For now, I am using couple services, so I have read the quick fix for the App now is to add NSAllowsArbitraryLoads into Info.plist. Add this to your Info.plist for a quick fix, but you should read the document for a better security.
<key>NSAppTransportSecurity</key>
<dict>
<key>NSAllowsArbitraryLoads</key>
<true/>
</dict>