Synology DiskStation Manager (DSM) is a Linux based software package that is the operating system for Synology's DiskStation and RackStation products. A CalDAV server is available in the base system. CardDAV can be installed as an extra package. It's also possible to run other CalDAV/CardDAV software like Baïkal and ownCloud on Synology systems. In this case, see the respective configuration pages for details.
The Calendar package provides a calendar with Web and CalDAV interface.
You can view the CalDAV URL in the Calendar Web interface (Calendar > CalDAV Account). Use the macOS / iOS URL.
So, the CalDAV Base URL could look like this:
Note: In previous Synology DSM versions, CalDAV was served using the WebDAV server package (default ports 5005/5006). This method is now obsolete. Make sure that you don't have enabled CalDAV in the WebDAV server package when you use the new Calendar package. If you don't need WebDAV for file access, you can completely uninstall the WebDAV server package.
The Calendar package seems to provide a CardDAV service, too. This is why "CardDAV" appears in DAVx⁵ accounts created for Synology Calendar. You can even create an address book using DAVx⁵. However, this feature is not officially supported and there's no user interface in the Calendar package. So, use the CardDAV server package instead (see below).
The CardDAV Server package provides a CardDAV server with address book backend in the Web interface.
CardDAV Base URL:
https://diskstation.example.com:8443/addressbooks/users/sample if your user name is
For older versions of CardDAV server, you need to append
addressbook like that:
User name and password: same as for Synology DSM
Contact group method: groups are separate VCards
Do not import .vcf files generated by Android directly into the Synology CardDAV server! It may break synchronization, because Android sometimes exports invalid vCard files.
If you're still using the WebDAV package (instead of the Calendar package) for CalDAV (which is not recommended):
- Open Synology DSM: Control Panel / WebDAV.
- Enable WebDAV or WebDAV HTTPS and remember the port.
- Enable CalDAV in the WebDAV server package.
- Go to "View calendar list" and add a calendar. Make sure that you have read/write permissions on the destination folder.
- In the calendar list, each calendar has a location (e.g. MyFolder/Work). This location is required to add the calendar with DAVx⁵.
Now you can add an account in DAVx⁵:
If you're accessing a newly created calendar/task list, Synology returns 404 Not Found when this collection is queried by DAVx⁵. To work around this, add an event and a task to the calendar (e.g. with DAVx⁵). Then synchronize and the 404 error should be gone. If possible, use the new Calendar package on your Synology device to avoid this problem.