title: Invalid Form Key. Please refresh the page. on magento admin login page
body: <p>I have a weird situation again that I have encountered on Magento. A few hours ago, I successfully logged in to admin dashboard. After I logged out and restart my pc and tried to log in again. I got an error</p>
  <blockquote>
  <p>Invalid Form Key. Please refresh the page.</p>
  </blockquote>
  <p>Magento was installed on a live server. I didn't change anything or add something to the database. Credentials are valid but we cannot log in. Also, I cannot login to the Magento downloader panel.</p>
  <p>What kind of bug is this?</p>
  <p>How can we solve this?</p>
  <p><strong>UPDATE!</strong></p>
  <p>From @DouglasRadburn link. The detailed explanation of the problem and the possible solutions.</p>
  <blockquote>
  <p><a href="https://magento.stackexchange.com/questions/98220/security-patch-supee-7405-possible-problems/98236#98236">https://magento.stackexchange.com/questions/98220/security-patch-supee-7405-possible-problems/98236#98236</a></p>
  </blockquote>
  <p>Also similar to @Makwana Ketan answer</p>