During eDirectory configuration phase I get the error: "Fehler beim Abrufen des eigensignierten Zertifikats von der Baumzertifizierungsstelle" i.e. error getting the CA certificate from directory tree.

Under OES2015SP1 everything seemed to be o.k. I.e. all server certificates can be validated

Seems starting point still has got an error :-( ... but where to find?