Set core IP to None when configured ip is auto to surive IP changes

darcs-hash:20090429164906-58103-c3ff36da4d239c3762e5c43fee5ae8c1d6e001c8
If account registration fails because of 401, retry in 1-2 minutes

darcs-hash:20090429165541-58103-45b6550ae9c043b73367cd88aa3c9aba8ae826a7