I have setup a Baikal-calendar on my NAS now and have a similar problem than the guys above.
I am able to connect to my Baikal-calendars in eM Client and via my Android phone using "CalDAV Sync Beta". No problems so far.
But with rainlendar I am not able to properly connect to the Baikal-server. In eM Client both of these ways work:
With the first I can directly connect to one of my calendars, specifying the name of it. With the second version eM Client shows all calendars for USERNAME in a tree-view.
For Rainlendar the second version should be fine, cause it asks me to choose one calendar, right? If I click on "Choose calendar", however, it says "Verbindung zum Server fehlgeschlagen" (German for: Failed to connect to server").
What can I do?
Rainlendar: Rainlendar Pro BETA - Version 2.12 (b133) 64 bit
Baikal: baikal-flat 0.2.6
Thanks for your help!