A simple tweak
This is a question I was asking every here and there on forums, from last 2 days but finally got the solution.
Magneto has a Good security.
According to this some url are block for admin, so if you are using any domain name or http://localhost/ then just use the IP address of that server, in case of localhost just use 127.0.0.1 instead of localhost, Now your Url will look like on Local
and on your server.