When the --vncport option is used, virt-install exits with the libvirt error:

  libvir: Xen Daemon error : POST operation failed: (xend.err 'Error creating
domain: int argument required')

and accompanying backtrace:
  Failed to create domain vm1
  Traceback (most recent call last):
    File "/usr/sbin/virt-install", line 406, in ?
      main()
    File "/usr/sbin/virt-install", line 370, in main
      dom = guest.start_install(conscb)
    File "/usr/lib/python2.4/site-packages/virtinst/XenGuest.py", line 355, in
start_install
      self.domain = self.conn.createLinux(cxml, 0)
    File "/usr/lib/python2.4/site-packages/libvirt.py", line 249, in createLinux
      if ret is None:raise libvirtError('virDomainCreateLinux() failed')
  libvirt.libvirtError: virDomainCreateLinux() failed

The same libvirt error is seen if an xml file having the port attribute of the
graphics tag set to a value greater than 5900 is used with virsh, for e.g:

<graphics type='vnc' port='5940'/>

# virsh create vm1.xml
libvir: Xen Daemon error : POST operation failed: (xend.err 'Error creating
domain: int argument required')
Failed to create domain vm1
error: Failed to create domain from vm1.xml

Using a port value of <=5900 seems to pick a new port each time (adds one to the
last used port).

Version-Release number of selected component (if applicable):
xen-3.0.3-8.el5
libvirt-0.1.8-1.el5
python-virtinst-0.96.0-2.el5

How reproducible:
100%

Steps to Reproduce:
1. Specify --vncport=<value > 5900> on virt-install command line, or create an
xml domain description including a port attribute > 5900.
2. Attempt to create the comain with virt-install or virsh

  
Actual results:
libvirt error or automatically assigned port

Expected results:
Domain is created with the chosen VNC port.