Along with many other web hosts around the world we are currently seeing a DDoS attack targeting WordPress installations on shared hosting.
Some hosts have starting removing access to either the WordPress Admin or the “wp-login.php” script, but this then means you can’t update your site if you want to.
At this time we are adding extra security to try to prevent this, but may take further measures later today if this continues. Further updates for our clients will be available in our Network Status area of our Portal.