No CalDav connection possible with Mac OS Sierra

After upgrading to Mac OS Sierra my fine running connection to Nextcloud on an Raspberry Pi got broken. The calendar can not update entries anymore. I deleted the CalDav setup in the system preferences and now I can’t connect it anymore. I tried any combination in address links but it always tells me that the login data could not be authenticated. But they are correct as they work on another computer running with Mac OS X El Capitan and on my iPod as well. The webinterface can be reached with the browser. Why does the Mac OS not connect?

I found the solution myself. It was the wrong port number, which has to be 443 in the advanced settings of the CalDav preferences.

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