If you're accessing an empty calendar (for instance, because it has just been created), Synology returns 404 Not Found when this collection is queried.Known issues (can both be worked around by using the Calendar package instead of the WebDAV Server package for CalDAV): You can omit the last directory level (TestCalendar in the screenshot), because DAVx⁵ will enumerate all calendars in the given folder.ĬalDAV base URL: http(s)://diskstation.example:5005/test/SomeFolder This location is required to add the calendar with DAVx⁵. In the calendar list, each calendar has a location (e.g.Make sure that you have read/write permissions on the destination folder. Go to 'View calendar list' and add a calendar.Enable CalDAV in the WebDAV server package.Enable WebDAV or WebDAV HTTPS and remember the port (5005 in the screenshot).Open Synology DSM: Control Panel / WebDAV.If you're still using the WebDAV Server package for CalDAV (which is not recommended):

If possible, use the newer Calendar package instead of the outdated CalDAV function of the WebDAV Server (which doesn't seem to be maintained anymore) package to avoid problems. See also: Synology KB: How can I sync Synology Calendar with CalDAV clients? So, use the CardDAV server or Synology Contacts instead (see below). However, this feature is not officially supported and there's no user interface in the Calendar package. You can even create an address book using DAVx⁵. This is why 'CardDAV' appears in DAVx⁵ accounts created for Synology Calendar.

The Calendar package seems to provide a CardDAV service, too.

You may also have to additionally open these ports when you need CalDAV access from outside. Or if you're using LDAP You can also use port 38003 (HTTP) or 38443 (HTTPS). So, the CalDAV Base URL could look like this: You can view the CalDAV URL in the Calendar Web interface (Calendar > CalDAV Account). The Synology Calendar provides a calendar with Web and CalDAV interface.

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