UltraVNC

Ok it works but i have a little problem.

The command i use is:

xtightvncviewer -listen 12015 -encodings "hextile copyrect"

But the terminal gives me this:

xtightvncviewer -listen: Listening on port 17515 (flash port 17415)
xtightvncviewer -listen: Command line errors are not reported until a ...

In some topics i see that many people have resolved the viewer problem on linux with this command:

vncviewer -listen -encodings "hextile copyrect"

But if i put this command in the terminal i obviously receive an error and vncviewer shows me an help...

So what's the right command?

I am on ...