I have never seen this error message in all my time using emacs:
Network unreachable!
Try M-x auto-install-handle-emacswiki-package-name afterward.
(I did have a network connection.)
It was surely caused by the following two lines in my .emacs, which I have now removed:
;; (require 'auto-install)
;; (auto-install-update-emacswiki-package-name t)
Probably with the package system, auto-install is no longer necessary. Just wanted to note a behavior difference between rc1 and rc2, and put this into emacs-devel for posterity.
JDO