I am facing the same issue today. Is the sandbox down or is there any way to find out. The system status shows the App Store is up and running but I believe it is the production system status.
_error NSError * domain: @"NSURLErrorDomain" - code: 18446744073709550615 0x00000001c0857610
_userInfo __NSDictionaryI * 6 key/value pairs 0x00000001c04f6200
[0] (null) @"NSUnderlyingError" : domain: @"kCFErrorDomainCFNetwork" - code: 18446744073709550615
[1] (null) @"NSErrorFailingURLStringKey" : @"https://sandbox.itunes.apple.com/WebObjects/MZFinance.woa/wa/inAppBuy"
[2] (null) @"NSErrorFailingURLKey" : @"https://sandbox.itunes.apple.com/WebObjects/MZFinance.woa/wa/inAppBuy"
[3] (null) @"_kCFStreamErrorDomainKey" : (long)4
[4] (null) @"_kCFStreamErrorCodeKey" : (long)72057594037925834
[5] (null) @"NSLocalizedDescription" : @"Cannot connect to iTunes Store"
_o