To be completed by the original poster:
CMS Version
Xibo CSM 4.0.12
Player Type
Windows
Player Version
Xibo for Windows v4 R402.1
Issue
Neither Outlook nor Google based ICS files work, Weather Widgets Don’t work, RSS feeds using HTTPS don’t work. Constantly getting cURL 28 or cURL 60 on everything in the log. Certificate errors from major websites including CNN and the Associated Press, let alone Google and Microsoft are unlikely. Something is configured wrong somewhere but finding it is proving excessively difficult.