VNC 4.0 - param securitytypes

[Pasztuhov Daniel]

Hi,

I tried out the new version of VNC (4.0) and I have some troubles with that:
I try to start a vncserver on a SuSE 9.0 linux box as:

vncserver :2 -securitytypes=none

In the file ~/.vnc/linux:2.log I find:

---
Unrecognized option: securitytypes=none
use: X [:<display>] [option]
-a #                   mouse acceleration (pixels)
-ac                    disable access control restrictions
-audit int             set audit trail level
-auth file             select authorization file
bc                     enable bug compatibility
[...]
-nevershared           never treat new clients as shared
-dontdisconnect        don't disconnect existing clients when a new 
non-shared
                       connection comes in (refuse new connection instead)
-localhost             only allow connections from localhost
                       to the vnc ports. Use -nolisten tcp to disable
                       remote X clients as well.
-viewonly              let clients only view the desktop
-interface ipaddr      only bind to specified interface address
-inetd                 Xvnc is launched by inetd
xrdb: No route to host
xrdb: Can't open display 'linux:2'
xsetroot:  unable to open display 'linux:2'
xterm Xt error: Can't open display: linux:2
twm:  unable to open display "linux:2"
---
... and the vncserver does not start.
There is no securitytypes anywhere... while in the docs of Xvnc there is 
one...

My questions are:
What is wrong?
How can I start a VNC Server with no authentication?
What are the constraints starting it?

Thanks,
Dani