In principle, KOrganizer (kontact?) should be able to _subscribe_ to calendars hosted by DCS, if EnableMonolithicCalendars is enabled (default). The problem is an "exception" hacked into CalendarServer/twistedcaldav/ resource.py: Whenever a normal browser connects to an …/ <calendarname>/-URL, it does NOT get the collection as ics file, but a nicely rendered HTML page. KOrganizer's problem is that it cannot be destinguished from konqueror (in my case, it identifies itself as "Mozilla/5.0 (compatible; Konqueror/3.5; Linux) KHTML/3.5.7 (like Gecko) SUSE") and therefore gets an HTML page instead of an ics file. The check is 119 if config.EnableMonolithicCalendars: [ comments, explanation, telling it's a hack ... ] 132 agent = request.headers.getHeader("user-agent") 133 if agent is not None and ( 134 agent.startswith("Mozilla/") and agent.find("Gecko") != -1 135 ): 136 renderAsHTML = True 137 else: 138 renderAsHTML = False I added a (dirty) check to evaluate a certain get request, and then disables that special handling for browsers: 134 agent.startswith("Mozilla/") and agent.find("Gecko") != -1 and not request.uri.endswith("/?ics") This way all browsers and kontact can get ics-files whenever they add "?ics" to the calendar path, e.g. https://www.example.com/calendars/doe/calendar/?ics Of course, this is not a real solution, but I think it's an acceptable workaround because it affects only a single line and does not change the behavior of the server otherwise at all. Regards, Markus