[Owncloud] KAddressbook and Lighttpd

[Felix Lenders]

Hi,

I'm using a bit of my christmas time to set up an owncloud server. So far, 
it works very well with Thunderbird as well as with the CardDAV Android App. 
However, I usually use Kontact and so I'd like to be able to sync to 
KAddressbook. However, with the KDE Groupdav Connector, it doesn't work. In 
the server log, I see something like this:

91.49.185.226 xxx.myserver.de - [29/Dec/2011:16:38:42 +0100] "PROPFIND 
/apps/contacts/carddav.php/addressbooks/felix/default/ HTTP/1.1" 404 288 "-" 
"Mozilla/5.0 (X11; Linux x86_64) KHTML/4.7.4 (like Gecko) Konqueror/4.7"

whereas the entry for CardDAV App is

91.49.185.226 xxx.myserver.de - [29/Dec/2011:17:29:04 +0100] "PROPFIND 
/apps/contacts/carddav.php/addressbooks/felix/default/ HTTP/1.1" 207 10635 
"-" "CardDAV-Sync for Android (gzip)"

which indicates, that there is some Authentification issue. There are 3 
choices to dig in:
- Owncloud
- KAddressbook
- Lighttpd + FastCGI

Does anyone of you have an idea where to error might come from or where to 
look at?

Thank you very much!
Felix