On 2/3/2013 1:42 PM, Cliff Pratt wrote:
There's a lot of conflicting information on this topic on the Internet. Most current VNC servers seem to listen on port 590n. I've seen it claimed that a) port 580n is not used and can be blocked, b) 580n is used for the Java VNC client, c) 580n is used for browser requests for VNC (probably via the Java VNC client, I'd guess).
I don't know when the change occurred and it may be that it happened when RH changed from one VNC brand to another.
traditional Windows VNC always used 590x for client->server connections. 580x was used for 'browser' requests to serve up a java VNC client that would then use 590x, and some VNC's also use 580x for file transfers. there's also port 550x used by some configurations for a 'callback' sort of connection.