We've been here before totte. You need to provide your console log for us to be able to provide any help.
This should not be news to you. I say the same thing every time you post a thread. The rules don't change just because you post a new thread.
Bouncy Castle issue.
Apparently now a vanilla issue.
Formerly was "solved" by downloading the server configs and replacing the client configs with the server configs.
I don't know if that works with the new issue however.