Hi there! I am having the same problem with my WordPress blog. After making some adjustments the other day, I got locked out of the admin panel.
Now it redirects to a weird login site where I then enter my admin password, press enter and then 404 Not Found -The requested URL /wp-admin does not exist.
I used the information above in hopes the solution would work. I downloaded a fresh wordpress and copied the wp-admin files over my FTP to the blog, and still no change.
I need help. What do I do to get the "password required" box from popping up when my site is visited? And how do I get the wp-admin to work again?
I am not sure what I did in the first place to get these 404 errors. I was trying to be careful, and havent changed much.