Calendars not shown in the list

[AutoImport-neFAST]

I just discovered davdroid and decided to give it a try (I was previously using dtmf CalDAV-Sync)
My problem is that after I enter the adress and my login/pass, the list of available calendars is empty.
Unfortunately I don’t know which platform is at the other end (but I’m sure it’s a windows server)
I’m not using https
http://cal.domain.com:5232/calendar/

and my login looks like this: first.last@domain.lan

Is there a way I can provide logs to help sorting this out?
Thanks a lot

Processing multi-status element: http://cal.domain.com:5232/firstname.lastname%40domain.lan/
Received multistatus response:
<?xml version="1.0"?>
<multistatus xmlns="DAV:" xmlns:C="urn:ietf:params:xml:ns:caldav" xmlns:CR="urn:ietf:params:xml:ns:carddav" xmlns:ICAL="http://apple.com/ns/ical/">
  <response>
    <href>/firstname.lastname@domain.lan/</href>
    <propstat>
      <prop>
        <C:calendar-timezone>BEGIN:VCALENDAR
END:VCALENDAR
</C:calendar-timezone>
        <displayname>firstname.lastname@domain.lan</displayname>
        <resourcetype>
          <principal />
          <C:calendar />
          <collection />
        </resourcetype>
        <C:supported-calendar-component-set>
          <C:comp name="VTODO" />
          <C:comp name="VEVENT" />
          <C:comp name="VJOURNAL" />
        </C:supported-calendar-component-set>
      </prop>
      <status>HTTP/1.1 200 OK</status>
    </propstat>
    <propstat>
      <prop>
        <CR:addressbook-description />
        <ICAL:calendar-color />
        <C:calendar-description />
      </prop>
      <status>HTTP/1.1 404 Not Found</status>
    </propstat>
  </response>
</multistatus>
Processing multi-status element: http://cal.domain.com:5232/firstname.lastname%40domain.lan/

and without preemptive auth.

Processing multi-status element: http://cal.domain.com:5232/calendar/
Received multistatus response:
<?xml version="1.0"?>
<multistatus xmlns="DAV:">
  <response>
    <href>/calendar/</href>
    <propstat>
      <prop />
      <status>HTTP/1.1 200 OK</status>
    </propstat>
    <propstat>
      <prop>
        <current-user-principal />
      </prop>
      <status>HTTP/1.1 404 Not Found</status>
    </propstat>
  </response>
</multistatus>
Processing multi-status element: http://cal.domain.com:5232/calendar/

Finally when giving the full path to the ics instead of the folder. (still without preemtive auth.)

Processing multi-status element: http://cal.domain.com:5232/calendar/
Received multistatus response:
<?xml version="1.0"?>
<multistatus xmlns="DAV:">
  <response>
    <href>/calendar/firstname.lastname.ics/</href>
    <propstat>
      <prop />
      <status>HTTP/1.1 200 OK</status>
    </propstat>
    <propstat>
      <prop>
        <current-user-principal />
      </prop>
      <status>HTTP/1.1 404 Not Found</status>
    </propstat>
  </response>
</multistatus>
Processing multi-status element: http://cal.domain.com:5232/calendar/fistname.lastname.ics/

[rfc2822]

Do you know how to get logcat output? This would be needed.

[AutoImport-neFAST]

Here we go.
It seems to be querying “http://cal.domain.com:5232/firstname.lastname%40domain.lan/” instead of “http://cal.domain.com:5232/calendar/” when using preemtive authentication.
Without this option, I get a 404

[rfc2822]

It seems like the server is misconfigured. When asked for children of http://cal.domain.com:5232/calendar/, it answers with /firstname.lastname@domain.lan/ (note the missing /calendar/). For radicale, this setting is called base_prefix. Please contact your server provider with this message/issue report to fix the problem.