Disable LoggingConnectionDelegate's connection:willSendRequestForAuthenticationChallenge because implementation is incorrect and causes (immediate) request failure.

See https://developer.apple.com/library/prerelease/iOS/documentation/Foundation/Reference/NSURLConnectionDelegate_Protocol/index.html#//apple_ref/occ/intfm/NSURLConnectionDelegate/connection:willSendRequestForAuthenticationChallenge:

for implementation recommendations