Comment 12 for bug 1281250

Upstream comment

"I guess that the problem occurs after the default was changed to require encryption:

https://git.gnome.org/browse/vino/commit/?id=f37ca213fda500ea2f93d005e945644c2f2e5721

For whatever reason, that fails with some clients. If you want Vino to work
with those clients new authentication types need to be added. There is some
information about the protocol and security types at:

http://sourceforge.net/p/tigervnc/code/HEAD/tree/rfbproto/rfbproto.rst

I will not have time to add the security types in the near future."