Sorry, completely forgot to mention. There are a few things what could be wrong from server side which you can check:
-
Your webserver setup is messing around with the WebDAV/CalDAV/CardDAV interface of ownCloud
→ See this FAQ: How to fix CalDAV|CardDAV|WebDAV problems -
The .well-known URLs are not redirecting correctly (as you see in your posted link)
→ Open http://example.com/.well-known/caldav and http://example.com/.well-known/caldav in your browser
→ These needs to redirect to http://example.com/remote.php/dav -
You’re using a strong password with special chars not supported by WebDAV
Those are the points which could be wrong from server side. Anything else needs to be debugged from Mac OS X site as advised above.