I've been getting odd Blogger messages all day today, especially when I've been posting comments and/or hitting the browser 'back' button. Weird FORBIDDEN! and YOU DON'T HAVE ACCESS TO THAT SERVER! type nastiness.
Oh, don't even start to take that tone with me!
If it happens to you, hit 'refresh' and it eventually goes away. Oh and you might want to stare it down and shake your fist at it too. It's more fun.