I am trying to publish my "Outlook 2013" calendar to my self-hosted owncloud 7.0.2 on a QNAP. owncloud is configured to accept only https.
I copy the link for the calendar from owncloud calendar site of my user and it looks something like this:


When I do this and try to publish from outlook I get an error message. I have to translate it because I don't have an english OS so the exact english message might look a bit different but it says:
Error uploading from "Calendar". Problem with the request.

I also see an error in the event viewer: EventID: 36888
Source: SChannel Message: severe warning was generated and sent to remote endpoint. This can lead to terminating the connection. The severe warning has the following TLS protocol defined code: 40. The windows SChannel error status is: 252

Does anyone know what this means and how to fix it?
I have searched the internet but it looks like no one had problems with publishing to owncloud.
I tried to disable the firewall (which one site mentioned to try). All other sites did not really have similar problems described.

Just as a side info: Outlook tries to connect. Pops up a warning because of the certificate and asks me if I want to proceed. After I confirm it pops up the logon credentials screen and I enter my credentials. Then it tries to upload for about 10 seconds and finishes with the described errors.

Any Ideas on how to debug are greatly welcome. Possibly with wireshark? Haven't ever used it though.

To prevent confusion some more info:
I am not using an exchange server. My outlook is a local installation and saves all settings to a local PST file. I am using the function "publish online" -> "publish to webdav-server" on the calendars tab "start" menu.

  • What URL do you get when you publish your Outlook calendar? I get outlook.office365.com/owa/calendar/xxx/xxx/calendar.ics
    – Sun
    Dec 15, 2014 at 22:13
  • Well, I don't get an URL as it does not succeed.
    – Uwe Hafner
    Dec 16, 2014 at 6:56
  • Yes. It is possible. There are numerous descriptions on the internet how people publish to google and owncloud. It just does not work for me and I don't know how to debug further to get more information on the problem or what I am doing wrong.
    – Uwe Hafner
    Dec 16, 2014 at 8:02
  • I see that I provided some confusing information. I updated my question to clarify my setup. Thanks.
    – Uwe Hafner
    Dec 16, 2014 at 8:11
  • as posted: outlook 2013
    – Uwe Hafner
    Dec 16, 2014 at 17:53


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