This is a handy tip to help you protect your Magento backend against Hackers and brute-force attacks. I recommend you change the default URL to the Magento Admin Panel. It is really quick to do and adds an additional layer of security to your site.
Replace admin with your new admin path. This should be something unique which should be a little hard to guess, only use letters.
The change is now complete and you should try to log in via the new admin url – http://domainname/adminpath/, replacing ‘adminpath’ with the path you chose in the step above. If everything went fine, you should now be presented with the Admin Panel login screen at the new URL. The old admin login URL should return a 404 error message.