Unable to upload app to iTunes Connect - iTunes Store operation failed. Authentication timeout

Question

I\'m trying to upload my app to iTunes Connect with Xcode. I chose product > archive, choose my account, it compiles and when I try to upload it hand for a long time on:

Answer 1

A couple of Xcode restart didn't resolve the issue but Application Loader solved it for the very first attempt. Also, Application Loader, is more descriptive for letting one know what's going on during the whole upload process. Plus simultaneous apps upload is possible via Application Loader.