Can't subscribe to .ics calendar

Question

Hello,
First of all, sorry for my bad English.
I have published a calendar from Ical to my private server (Imac running 10.6.2). When I want to subscribe to that .ics file from an other computer (other Imac running 10.6.2), it fails. When I subscribe from a computer running OSX 10.4 or 10.5 there's no problem.
This is the error:
*There was an error subscribing to the calendar.*
*The data downloaded from http://server.name.lan/calendars/name.ics isn’t valid.*
I think the problem has to do with the server settings. But I don't know for sure and I don't know how to solve. The server is a Xserve running 10.5 server. For some reason Ical have permission top place the .ics file, but he can't acces is anymore. The permission settings are oke, everybody on the network can read and write the files.
I could send the errors if someone need them to help.
Thanx

Answer 1

The authentication requested is a javascript form of the apple web interface to ical (Web server -> Sites -> Web Services -> Calendar). It is an apple application, i didn't set up any access control, if i go into the file system of http://www.my_site.com/ical (/Library/WebServer/Documents/my_site) there is nothing. It seems all saved under:
bash-3.2# pwd
/Library/CalendarServer/Documents/calendars/_uids_/08/46/084627AA-F6CF-481C-A0EF-421E878ADBCF/calendar
bash-3.2# ls
.db.sqlite a32259e5d9222e11c83f9b8487e0e041.ics
bash-3.2#
and there must be an apple web application in order to interact with it, that is why i thought that the username and password defined in the publish calendar form were related to the apple authentication mechanism.
I'm using MacOSX server 10.6.2 on my own machine with my own domain. So what i'm doing is setting up the calendar web service on a test site, try to publish a calendar (from ical) to the location of the test site and then try to subscribe to the webcal:// ... link that he provides me.
If i try to access http://www.my_site.com/ical/calendar.ics or http://www.my_site.com/ical the apple web interface comes up asking me the credentials. If I enter the correct ones (defined in the publish form) i get the following message from the apple web interface:
Mac OS X Server
404: User does not exist
The path seems correct 'coze if subscribe from ical to webcall://www.my_site.com/ical/calendar.icsit tells me that:
There was an error subscribing to the calendar.
The data downloaded from http://www.my_server.com/ical/name.ics isn’t valid.
if i enter another path i will get this error:
A calendar wasn’t found on webcal://www.myserver/my_user/ical/mycalendar.ics. Check the URL.
If i would use an FTP application i would not find anything on that path because all is managed by the apple web service interface.
Thanks !!