CalDav / (61)Connection refused: proxy: HTTPS: attempt to connect to [fe80::1]:8443 (localhost) failed

Hi, it seems that iCal, CardDAV etc. are run by some backend daemons that listen on local ports. CalDav service it configured to use either SSL ports: 8443 / 8843 or normal HTTP ports: 8008 / 8800.

I can't access the calendar server. When I do it, I see the following in the apache error log:

61)Connection refused: proxy: HTTPS: attempt to connect to [fe80::1]:8443 (localhost) failed

[Sun Oct 16 15:00:44 2011] [error] ap_proxy_connect_backend disabling worker for (localhost)

I'm not sure if the backend daemons run all the time or started on-demand. If not on demand, than this might be the problem because I don't see any process listen on localhost.8443 Even "serveradmin status calendar" states it's running.

Does anyone has an idea what this problem is about and how to fix it?