NTLM Authentication fails on iOS 10 and above

Originator:ratnapaul.aw
Number:rdar://29402344 Date Originated:Nov 28 2016
Status:Open Resolved:
Product:iOS SDK Product Version:10.0 and above
Classification:Core Network Reproducible:
 
1-Assume you are trying to access a authorized resource.You will be prompted with a NTLM challenge.
2-Create a NSURLCredential object with username/password. Setting Persistence to Session Fails authentication in below scenario.
3-The response to the challenge can be sent in two modes 
i)sent on a new TCP connection - this succeeds 
ii)the same TCP connection  - this fails

More details are available on this forum post - https://forums.developer.apple.com/thread/66003

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