I tried checking out the login attempt on the Java9 client PND. I couldn't determine anything useful. I am suspecting that Wireshark on the Pandora stops recording after a second, as after a second I got 1-5 packets and then none after that until I restart recording. Therefore I'm thinking I missed the login. I might be able to try on a laptop later, but honestly I'm not sure what to look for as I've never used Wireshark before.
I have uploaded a new version of the jre (server) version of the Launcher. This time, I took all the "security" folder (cacerts and all) of a jdk8 distribution to replace the one in the jre folder. Maybe it will work better this time?