Only one port exposed on NAT and have several VNC servers listening behind it.

[Js]

Hi list,

I know the functionality I'm asking for  isn't offered by realvnc but 
maybe someone can help me with advice, third party tools, etc,...
I have multiple vncservers listening on an internal network.
I have 1 public IP address and I want to make it possible that based 
upon login and password a user gets connected to the server that belongs 
his login.
....
Anyone an idea?

Thanks,...

Js