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Still getting this when trying to connect to the debugger. It works in version 126.96.36.1996 but not since they changed the ssh implementation (no longer using PuTty keys version).
I know its the ssh connection in SQL Developer that's the issue because when I use a PuTty session and tunnel to the same port SQL Developer is able to connect. When I use the earlier version 188.8.131.526 SQL Developer is able to connect (this version uses the PuTty gen key format). Both versions 19.4 and 18.4 are able to connect and seemingly establish the remote port, but 19.4 gives the error when trying to debug.