This is exactly what users want and you are basically breaking it by not honoring the cookies.
I'd be surprised if AFNetworking didn't also offer the ability to create a "private" NSURLSession with custom storage objects.
I'd also recommend looking into debugging these types of issues using, eg, Charles Proxy. There's more information on logging at:
https://developer.apple.com/library/content/qa/qa1887/_index...
See also:
https://developer.apple.com/videos/play/wwdc2013/705/
Disclaimer: NSURLSession contributor...