Questions about CalDav Syncproblems (three KDE machines + Android)

Fri Mar 27 09:48:26 GMT 2026

Now I set up a fresh Kontact/Korganizer client and added an appointment. Shows 
up instantly in Radicale Server, on Android App and in Thunderbird. Have been 
waiting on second KDE desktop for it to show up. Took an akonadictl restart so 
that the meeting showed up. Reload was not enough. 

Have changed the meeting time to two hours later (on first machine in KDE/
Kontact), is displayed correctly instantly on Server and Android and 
Thunderbird, but not on second KDE desktop. 

will do some more checks and debugging over the weekend. I also saw that the 
full ICS export from TB is bigger than that from Kontact, but there may be 
other reasons for that. 

I think I'll do a blogpost / article on debugging caldav. :-) Any help 
appreciated. 

Have a nice weekend and sorry for spamming (if so)

Am Freitag, 27. März 2026, 10:07:34 Mitteleuropäische Normalzeit schrieb 
Markus Feilner:
> Ok, in my radicale Container I can see ics-Files popping up for new
> appointments coming in. I can confirm from that that TB and DavX work as
> promised. Will test now with Kontact, Akonadi and Merkuro. I am using the
> debugger and features of akonadikonsole.
> 
> 
> Am Freitag, 27. März 2026, 09:29:58 Mitteleuropäische Normalzeit schrieb
> 
> Markus Feilner:
> > Fun fact: I installed Merkuro and found that it shows a third set of
> > calendar data. E.g. the appointment agreed upon via mail and postponed on
> > Tuesday for today does not appear at all. Seems like the akonadi backend
> > did not deliver neither one of the two to merkuro-calendar at all. So I
> > have three different sets of data:
> > 
> > a) The Master on the caldav server that is correct and works fine with
> > thunderbird and davX (Android)
> > b) the set in Kontact-korganizer via akonadi
> > c) the set in MerKuro via akonadi
> > 
> > I think I am getting there, slowly. What I also noticed: After a clean
> > login (remove the calendar from korganizer, restart kontact, add it
> > again) the data is correct, but as time goes by it is getting out of
> > sync.
> > 
> > In will fiddle around with what happens when I export and import calendar
> > data via files.
> > 
> > Thanks for letting me spam you here :-)
> > 
> > 
> > Am Freitag, 27. März 2026, 08:56:03 Mitteleuropäische Normalzeit schrieb
> > 
> > Markus Feilner:
> > > thanks for your answer, Vojtěch! Much appreciated.
> > > 
> > > Running a Radicale Caldav Server. That works like a charm with
> > > Thunderbird
> > > and DavX - Android. Only KDE Kontact gets out of sync.
> > > 
> > > e.g. In Kontact, I accepted an appointment change on Tuesday (it was
> > > scheduled for 10 am today, postponed to 15:00 today) that came in via
> > > mail.
> > > The change is only visible in the one KDE Kontact client that I accepted
> > > the change in (via mail invite).
> > > 
> > > So this is one client that probably is out of sync, the change never
> > > arrived on the server. This works fine with DavX and Thunderbird.
> > > 
> > > What I can reproduce is: Appointments in Thunderbird or DavX are
> > > instantaneously written to the server, but not every KDE client does
> > > recieve them, even though authentication and all server data are
> > > correct.
> > > Sometimes akonadictl restart helps, but not always and not on all
> > > machines. Weird
> > > 
> > > I would love to learn how to debug this in akonadiconsole e.g. – I'm
> > > digging deeper here...
> > > 
> > > 
> > > Am Freitag, 27. März 2026, 08:11:17 Mitteleuropäische Normalzeit schrieb
> > > 
> > > Vojtěch Zeisek:
> > > > Dne pátek 27. března 2026 7:47:20, středoevropský standardní čas,
> > > > Markus
> > > > 
> > > > Feilner napsal(a):
> > > > > Hi there, is this the right place to start a thread about Caldav
> > > > > sync problems with kontact / korganizer? I would love to learn
> > > > > about debugging it.
> > > > > I have three desktops with kontact, opensuse tumbleweed and
> > > > > plasma6 plus a few android devices. And somehow they always
> > > > > seem to be out of sync with my radicale CALDAV server.
> > > > > I can provide more details if wanted.. but is there a korganizer
> > > > > mailing list or so?
> > > > 
> > > > What is on the server side? I use it with NextCloud an SOGo and I
> > > > don't
> > > > have any issue... Did You double check that You download all resources
> > > > You wish to sync, You have some reasonable sync interval, etc.?

-- 

Best Regards - Mit freundlichen Grüßen,

Markus Feilner, Feilner IT
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