You enter correct credentials, the page reloads, and you are back at the login form with no error. This is a cookie problem, not a password problem.
1. Clear cookies and cache
Clear cookies for your domain, or test in a private window. This resolves it more often than anything else.
2. Check your site URLs
In wp-config.php temporarily add:
define('WP_HOME','https://yourdomain.com');
define('WP_SITEURL','https://yourdomain.com');Use exactly the address you type in the browser, including or excluding www consistently. A mismatch means the cookie is set for one hostname and read on another.
3. Deactivate plugins
Rename wp-content/plugins to plugins-off. Security and caching plugins are the usual culprits — caching the login page is a classic cause.
4. Define the cookie domain
Add to wp-config.php:
define('COOKIE_DOMAIN', false);5. Reset .htaccess
Rename it, then re-save permalinks after you get back in.
If you use Cloudflare, add a page rule to bypass cache for /wp-login.php and /wp-admin/*.
