Our update has been rejected twice today for ipv6 network connectivity issues. Our networking code has not changed between the previous release and this current release.
we met the same problem。 Our App has been rejected serval times for ipv6 reason . But We have been test in the ipv6 network which configed as APPLE's Offical Document: https://developer.apple.com/library/mac/documentation/NetworkingInternetWeb/Conceptual/NetworkingOverview/UnderstandingandPreparingfortheIPv6Transition/UnderstandingandPreparingfortheIPv6Transition.html#//apple_ref/doc/uid/TP40010220-CH213-SW1