I\'m trying to upload my iPhone .ipa file to iTunesconnect. I\'ve even uploaded builds recently successfully to iTunes Connect through application loader. But from last two
I had this exact same problem all day today and from the duplicate questions and spark of recent activity on the topic today, it looks like a few others had it all at the same time.
I just tried again and it randomly started working for me. There was no problem with my network or with my ipa files so all signs seem to point to it being an Apple problem with something being temporarily down. Unfortunately, the solution in my case was just to wait it out and keep trying.
Adding the OP's self-answer from the comments (paraphrased):
After trying multiple times, I was finally able to upload the app through Application loader.