From status.blogger.com:

Some BlogSpot blogs are currently receiving error messages that say "EOF while reading from control connection" when publishing. This varies according to which of our servers you are on at the time, so if you are having this problem, please try logging out of Blogger and then logging in again to publish, which should put you on a new server automatically. We are currently investigating the source of this problem.

Log off, log on. Standard answer to all problems.