Adding a VM from Network location

so my test setup is
    >>> hyper v 2012 r2 is called "hyperv" which is on a workgroup
    >>>>> the dc is called "dc-core"  on a test.private domain



  1. bare metal Hyper V R2
  2. I then have a VM which is a Windows 2012 Standard Server (evaluation) Core as a DC with a data fileshare which contains some ISOs i.e: ubuntu, this that bla bla

  3. I access the above using RSAT from Win 8.
  4. When i try to add a new VM and for image file, specify location i get the attached error message.

 I have already tried adding the hyper as a domain member . no difference.
 and also followed >>> http://social.technet.microsoft.com/Forums/windowsserver/en-US/123c6a43-f584-4e6b-a714-0f7b244b817f/error-trying-to-mount-the-dvd-to-a-network-based-iso-image-in-windows-2008-hyperv-rc0?forum=winserverhyperv


which has not made any difference. any idea
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