when trying to establish a connection to https://posteo.de:8443 as described on the DAVdroid as well as the posteo website I get a “E/A-Fehler: Connection to https://posteo.de:8443 refused” message. Playing around with some adaptions like adding a slash to the adress e.g. https://posteo.de:8443/ or adding @posteo.de to the username as proposed by posteo support did not help. Searching the I-Net also did not give a solution.
Although posteo support reports setting up DAVdroid on CM12.1 did work like a charm on one of their devices.
Maybe you have some hints for me how to analyse this problem.
DAVdroid 0.8.0 from F-Droid
Motorola Moto G 2nd Gen. 2014 running CM 12.1-20150601-NIGHTLY-titan (Android 5.1.1)
Thank you for your efforts.