Getting “Cannot verify client. (3000)” when trying to upload archive from Xcode to itunesConnect

Question

Just updated to Xcode 7.1 and getting this error. Was able to upload fine using 7.0.1

Answer 1

If you encounter this error, you have two options:

Option A - Engage in an activity that takes a minute or two. Could be any of the activities described in the other answers, like re-install XCode, renew certificates, do a new build from scratch after clearing caches. Or simply go get a coffee.

or

Option B - Do nothing at all for a little while.

Then, try again. If it doesn't work, repeat.