Unfortunately, as far as I understand. These additions are proprietary extensions to the open RFB standard that RealVNC has added.
I would gladly add support if these are documented open extensions.
From the FAQ (
http://remoterlabs.com/main/faq/)
I can’t connect to my RealVNC server anymore. I get “Unknown Authentication Scheme from VNC server: 5, 129″ or similar. How can I fix this?
RealVNC has support for their own authentication schemes, which are not part of the open RFB standard. These schemes are proprietary.
Please try configuring your server to not use the proprietary schemes, and you should be able to connect with Remoter (and other VNC clients) at that point.
In RealVNC, you can set the encryption to “Prefer On” (Rather than Always On), and the Authentication to “VNCAuth” (VNC Password Only) to allow Remoter to connect. (Thanks to Giingy for the tip)