The certificate does not work without www:
Hi! I have followed all the steps to install the free SSL certificate, but when I try without the www it doesn’t work: https://rasury.com/
ERR_SSL_PROTOCOL_ERROR
Its working on mine, with www and without www and you are using wordpress.
Please install a plugin called “Really Simple SSL” to force and overwrite all http requests or visitors into HTTPS without manually putting an https on web browser search box.
This is mostlikely your ISP/DNS Cache, which makes it easier and faster to get DNS records, however it can be annoying when updating websites. It will work when your isp next flushes their cache, most likely every night.