Hi,
I'm trying to connect to a Oracle database in the amazon AWS cloud via SQL developer.

Unfortunately I consistently fail with different connection errors
Bei der Ausführung des angeforderten Vorgangs ist ein Fehler aufgetreten:
I/O-Fehler: General SSLEngine problem, connect lapse 629 ms., Authentication lapse 0 ms.
Herstellercode 17002
Another connection error I had:
Handshake error
I tried to follow this example and a few others:
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/Appendix.Oracle.Options.SSL.html#Appendix.Oracle.Options.SSL.JDBC
Current JDK version: Build 1.8.0_181-b13
Current SQL Developer version: Version 18.2.0.183
I'm working under Mac OSX El Captain: 10.11.6
I also tried to install the certificates over the Java GUI but didn't help either:

Can't install on System and I get an password error when I try to upload it unter "User">"client authentication".
I'm out of ideas...
Thanks ahead,
Tobias Arnhold