Invalid Form Key. Please refresh the page, admin login

Question

I keep getting Invalid Form Key. Please refresh the page when i try to login into my admin account in the back-end.

I have, cleared all my cache both in magento_root/var/cache and in my browser i also have deleted the cookie path and domain web/cookie/cookie_path values in core_config_data table

I removed the data in var/sessions also as its a website currently in staging the last thing i did was install a blog plugin AW Blog and it worked with no errors and the last time i logged in successfully was last night so 12 hours ago

Answer 1

Please try this, Hope It's helpful for you.

The problem was the server configuration, i've change the max_input_vars parameter and the message dissapeared. I saw the solution in http://www.webcroppers.com/magento-invalid-form-key-please-refresh-the-page/

Answer 2

It seem's a force in a change/reset of the username and password fixed the problem, after i changed the password i flushed cache again like stated in the original question and it worked.