For the Secure Connection to work in DNS Proxy (Troubleshooting tab), your firewall needs to allow 
TCP ports 8822 and 9099 to the following:
support-server-wt1.titanhq.com  / 35.180.108.226 
support-server-wt2.titanhq.com  / 15.188.94.61 

Note:  these servers are in located in AWS Paris, so Geo-IP blocks may prevent this if enabled on the firewall.