Invalid Signature error !

Question

I am trying to update my application , but after uploading the binary , Itunes connect sends me this email :

Dear Developer, Thank you for your recent

Answer 1

A main point I'd like to offer is that Archive Validation (or submission thru App Loader) is supposed to identify the signature problem before sending the application to iTunes Connect. This is a first indication that the problem is related to a developer tools error.

Having witnessed this problem with multiple developers strengthens that hunch. In my experience the "Invalid Signature" diagnosis is not caught during client side validation as a result of a bug in older versions of Xcode. Devs simply update their OS X to 10.7.x, plus Xcode 4.2.1 and with no change to the project or code the app is ingested into iTunes Connect without issue.

Keep it in mind for others experiencing this problem...it's especially common on Snow Leopard with Xcode 4.0.2, 3.2.6 or less.

Apple's new publication touches on this point, see iTunes Connect Store - Binary Rejection emails - Invalid Signature.