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PHP hasn't been updated? The mysqlnd, if I am correct, is the PHP extension that talks to MySQL. So, did the actual MySQL database server get updated? You may need to get your hosting provider to work on this. See: https://www.cadence-labs.com/2017/08/wordpress-magento-mysql-php-fix-server-requested-authentication-method-unknown-client/ https://www.eschrade.com/page/the-server-requested-authentication-method-unknown-to-the-client-mysql_old_password/ https://serverfault.com/questions/295285/mysql-cannot-connect-via-localhost-only-127-0-0-1/297310#297310