1. Clear Cookies to Resolve Login Issues
WordPress uses cookies for login authentication, so the first step in troubleshooting WordPress login issues is the simplest one. Clear your browser cookies and cache. Also make sure that your browser has cookies enabled. After doing that restart your browser and then try to login.
2. Deactivate All Plugins
Connect to your web hosting using an FTP client. Rename /wp-content/plugins/ directory to plugins_backup.
3. Revert Back to the Default Theme
Connect to your website using an FTP client. Go to /wp-content/themes/ directory and rename your current theme directory to anything.
]]>