magento 1.9.2.3 admin login not working

happens with me most of the time

Delete cookies always solve my problem.

if you want to delete only one cookie then you can delete adminhtml cookie from your browser

and login works

Try to login from Firefox. if you are using chrome, most of the time it won't let you in.

This is a common problem in local server.

You can fix it by creating editing the hosts file (http://www.howtogeek.com/howto/27350/beginner-geek-how-to-edit-your-hosts-file/) to map a domain to 127.0.0.1.

For example: 127.0.0.1 local.mage.dev

After this you will need update your store URL in database, since your admin is not working.

To do this, run the following queries replacing the xxxxxxxxx by your store directory:

UPDATE core_config_data SET value = 'http://local.mage.dev/xxxxxxxxx/' WHERE path = 'web/unsecure/base_url';
UPDATE core_config_data SET value = 'http://local.mage.dev/xxxxxxxxx/' WHERE path = 'web/secure/base_url';