[Xen-users] What is required for Xen to show VNC for HVM installs?

[VPS Lime <vpslime@xxxxxxxxx>]

I have a stock CentosOS xen install.  (Just choose "Virtualization" from the install package list).  It is running paravirtualized VMs with no issues, however when I attempt to install a different operating system (like Ubuntu) using HVM and VNC=1, I can never attach the VNC client (remote)  to the server.  The exact same xen configuration file works on a different server.  I've turned off IPTABLES on the server having problems, so it is not a firewall problem.  Are there any special packages that I need to install to get the vnc session to come up?  I'm using a low vnc port (like 30), but that is not a problem on the other server. I don't see any errors in the xen log, and I've tried both a virt-install scripted install and a normal hand-built config + xm create, but neither brought up the vnc console.

Thanks in advance

Here is my xen config file, in case it gives any clues

name = "xen1-130"

builder = "hvm"

memory = "384"

disk = ['tap:aio:/xen/xen1-130.img,ioemu:hda,w','file:/xen/isos/ubuntu-10.04.1-server-i386.iso,hdc:cdrom,r']

vif = [ 'type=ioemu,mac=00:16:3e:01:01:24,bridge=xenbr1,vifname=xen1-130']

device_model = "/usr/lib64/xen/bin/qemu-dm"

kernel = "/usr/lib/xen/boot/hvmloader"

vnc=1

vncdisplay=30

boot="d"

vcpus=4

acpi="0"

serial = "pty" # enable serial console

on_reboot   = 'restart'

on_crash    = 'restart'

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