I administrate an Ubuntu 11.10 Server. I've installed tightvncserver on it so I can have a desktop environment on the server.
My issue now is, I'm running into issues with malicious people spamming the VNC server with authentication attempts. I've strengthened up the password, but it's still inconvenient as it restricts me from connecting as the person is using up all the authentication attempts.
There are pretty much around 5 IP addresses that should be able to ATTEMPT to authenticate to the VNC server, this person is using proxies from Romania, China, Korea, etc.
How can I accept authentication attempts to ONLY the IP addresses I specify?
Essentially, I want to do the opposite of this: How to deny VNC access to a particular IP?
And this with VNC instead: How can I allow SSH password authentication from only certain IP addresses?