I've checked support.qardio.com with Qualys SSL server test and it replies back with the IP addresses, with this error message: (Failed to communicate with the secure server). Additionally I checked the IP addresses 216.198.53.2 and 126.198.54.2 with AbuseIPDB and they are clean. The IP addresses are owned by Zendesk Inc, and a traceroute and ping both work without issues.
My browser indicates "ERR_SSL_VERSION_OR_CIPHER_MISMATCH" This is related to their SSL certificate. Store.qardio.com is the main website and it is hosted by a different content provider and simply provides a redirect to support.qardio.com. Could be something as simple as a certificate update gone wrong.