[Evolution] calDAV & cardDAV syncing - server authentication error

[Bob Kirby <bob kirby mail com>]

Hello:


running Evolution 3.18.5.2 on Mint-Cinnamon v18.0 with XFCE desktop.

Cannot connect to my email service provider's calDAV and cardDAV 
services in order to sync Evolution with web based calendar and contacts.

Under Calendar Setup, enter URL and user, click "Find Calendar," and 
always obtain the error "HTTP Error:Not Found."

I have successfully connected other devices (Android smartphone, tablet, 
other desktop email clients) using the same URL without problem.

Is there a workaround?

Thank you,