application loader stuck at the stage of “Authenticating with the iTunes Store”
$ vim /Applications/Xcode.app/Contents/Applications/Application\ Loader.app/Contents/itms/java/lib/net.properties
# replace `# https.proxyPort=443` with `https.proxyPort=80`
Verify you choose right provisioning profile(signed iPhone distribution). I has this problem with adhoc profile to test push notification on release version.