This week, many unhappy blog owners report inability to login to Blogger, and access their dashboards. In some cases, they are seeing the well known "404 Not Found" error. For a few folks, this error comes from an odd habit - which used to be supported by Blogger - but no more.
"www.blogspot.com", which used to redirect to "www.blogger.com", now does not.
If you use "www.blogspot.com" to access Blogger, access your dashboard, or to login, this is why you cannot access Blogger, access your dashboard, or login.
Update your bookmarks, and change your habits, when you login to Blogger. Don't use "www.blogspot.com" to access Blogger - use "www.blogger.com". If you need to avoid the local language redirect, use "www.blogger.com/start?hl=en" (for English access to Blogger), or use "www.blogger.com/start?hl=xx" (for any supported alternative language code "xx").