I did some more digging with ngrep and found something (10.0.0.2 is the server, 10.0.0.105 the client). The server seems to respond that I'm unauthorized. Anyone knows how to fix that? I can perfectly access the DCS with my webbrowser using the same username and password.

T 10.0.0.105:51820 -> 10.0.0.2:8008 [AP]

PROPFIND /calendars/users/admin/calendar/ HTTP/1.1..User-Agent: DAVKit/2.0 (10.5.2; wrbt) iCal 3.0.2..Content-Type: text/xml..Depth: 0..Content-Length: 374..Connection: close..Host: 10.0.0.2

:8008....

T 10.0.0.105:51820 -> 10.0.0.2:8008 [AP]

<?xml version="1.0" encoding="utf-8"?>.<x0:propfind xmlns:x2="http://calendarserver.org/ns/" xmlns:x1="urn:ietf:params:xml:ns:caldav" xmlns:x0="DAV:">. <x0:prop>. <x1:calendar-home-set/>.

<x1:calendar-user-address-set/>. <x1:schedule-inbox-URL/>. <x1:schedule-outbox-URL/>. <x2:dropbox-home-URL/>. <x2:notifications-URL/>. <x0:displayname/>. </x0:prop>.</x0:propfind>

T 10.0.0.2:8008 -> 10.0.0.105:51820 [AP]

HTTP/1.1 401 Unauthorized..Content-Length: 141..Server: Twisted/2.5.0+r19773 TwistedWeb/[twisted.web2, version 0.2.0 (SVN r19773)] TwistedCalDAV/?..DAV: 1, access-control, calendar-access, c

alendar-schedule, calendar-availability, inbox-availability, calendar-proxy..Date: Thu, 14 Feb 2008 11:47:19 GMT..Content-Type: text/html..WWW-Authenticate: digest nonce="1286297383624359573

1158487967", realm="Test Realm", algorithm="md5"..WWW-Authenticate: basic realm="Test Realm"..Connection: close....<html><head><title>Unauthorized</title></head><body><h1>Unauthorized</h1><p

>You are not authorized to access this resource.</p></body></html>

tom