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. -- john r pierce 37N 122W somewhere on the middle of the left coast