I have an application which works fine on Xcode6-Beta1 and Xcode6-Beta2 with both iOS7 and iOS8. But with Xcode6-Beta3, Beta4, Beta5 I\'m facing network issues with iOS8 but
Test if you can request from other apps (like safari). If not might be something on your computer. In my case I had this problem with Avast Antivirus, which was blocking my simulators request (don't ask me why).