Android client error after server update from 8.0.2 to 8.2.x

I use the android Pydio client v1.7 to access my Pydio server. All went well before I update from 8.0.2 to 8.2.x.
Now when I try the HTTPS settings it triggers the following error

Error: Android cannot verify the remote SSL certificate.

With HTTP only it says

No internet Connection.

I also have a former Pydio 8.0.2 instance on the same server and all goes fine with this.