Can't connect to Virtual box remote screen on linux Fedora 17 host

[Fanf]

I get trouble to use virtualbox remote screen on a linux host. I activated server in settings->display->remotedisplay and the port is 33333.

Then on linux I do : $ rdesktop 127.0.0.1:33333

Autoselected keyboard map en-us
ERROR: 127.0.0.1: unable to connect

I have read info here http://www.virtualbox.org/manual/ch07.html. I tryed various connections addresses like localhost and my local IP, and checked netstat, port scanning.
I removed the firewall.
Also tryed to start the vm headless. and still can't connect

Here is more info, Thanks for your help in advance

$ uname -a Linux rocky 3.6.10-2.fc17.x86_64 #1 SMP Tue Dec 11 18:07:34 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

$ vboxmanage -v 4.2.4_RPMFusionr81684

After starting the virtual machine I do :

netstat -t -l -n

Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN
tcp 0 0 127.0.0.1:25 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:58144 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:54690 0.0.0.0:* LISTEN
tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN
tcp6 0 0 :::22 :::* LISTEN
tcp6 0 0 :::631 :::* LISTEN
tcp6 0 0 :::111 :::* LISTEN
tcp6 0 0 :::36465 :::* LISTEN

or, with resolving port name

netstat -t -l

Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 *:ssh : LISTEN
tcp 0 0 localhost.localdoma:ipp : LISTEN
tcp 0 0 localhost.localdom:smtp : LISTEN
tcp 0 0 *:58144 : LISTEN
tcp 0 0 *:54690 : LISTEN
tcp 0 0 *:sunrpc : LISTEN
tcp6 0 0 [::]:ssh [::]:* LISTEN
tcp6 0 0 [::]:ipp [::]:* LISTEN
tcp6 0 0 [::]:sunrpc [::]:* LISTEN
tcp6 0 0 [::]:36465 [::]:* LISTEN