Jordan on "DSM 6.0.2 and Synology package 2.03.23"

Root cause: Synology Firewall was blocking the loading of the application page. Disabling the firewall allowed the IDrive configuration page to load.

Re-enabled the Synology Firewall and allow "Web Station" on Port 80.
Control Panel -> Security -> Firewall -> Edit Rules -> Allow "Web Station" on Port 80