PROPFIND Method Not Allowed caldav-beta9

[Jean-Christophe Delaye]

We're trying to use calendars with Cyrus IMAPD v2.4.17-caldav-beta9.

The following caldav settings are in imapd.conf

httpmodules: caldav
httpprettytelemetry: 1
calendarprefix: #calendars

http/https process are listening.

master[27932]: [ID  local2.debug] listening for messages from http
master[27932]: [ID  local2.debug] listening for messages from https

When trying to use calendars features with Thunderbird/24.5.0 
Lightning/2.6.5,
Create a new calendar (network)
Format CalDAV
Location http://cyrus0.eurecom.fr/dav/calendars/users/foo/Default/

I have errors in log:

http[1360]: [ID 213405 local2.debug] read & parse request-line
http[1360]: [ID 472354 local2.debug] read & parse headers
http[1360]: [ID 702911 local2.info] xxxxx.eurecom.fr with "Mozilla/5.0 
(X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 
Lightning/2.6.5"; "PROPFIND /dav/calendars/users/foo/Default/ HTTP/1.1 
(depth=0) => "405 Method Not Allowed" (error=The requested method is not 
allowed for the URL.)
http[1360]: [ID 286617 local2.debug] read_body(0x8)

does anyone have any ideas what could be causing this ?

Thanks in advance.