I created an account according to the guide from YT "Nextcloud in DSM 6.1.4 - Installation, configuration and testing"
The problem is that with Android I have the error "SSL initialization failed"
I did No-IP and in the DMZ router on Nas Nas. By www from another computer that is not on the network, I can easily log in the same through the web and I will enter the phone.
Typing in the application: https://abc123.ddns.net:5000 causes the above message.
Typing without port "Server not found"
I came across: https://help.nextcloud.com/t/ssl-initialization-fails/18666
However, I do not know where to change it ...