kCFStreamErrorDomainSSL, -9802 when connecting to a server by IP address through HTTPS in iOS 9

Question

We have an iOS app that connects to our server through HTTPS. When the app is built with the new iOS 9 SDK and ran under iOS 9, the following error occurs:

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Answer 1

I found another stack overflow answer with a checklist of the exact new requirements on the server to full fill the iOS 9 default App Transport Security requirements: iOS 9 Security Server requirements Checklist

Hope that helps.