maintenance mode

Just a shot in the dark but on the Authors and Users page is your name set to Admin?

yes it is

To anyone with this problem now in 2008, this plugin will hijack your site. It adds a ton of Meta tags in all of your WordPress files. For more information on what they say, email me at abray918 at yahoo dot com. I know how to fix it.

when I moved my server and waited for dns propagation,I use this plugin instead
https://www.shiftthis.net/wordpress-lock-out-plugin/

it works like a charm ??