I have virtualized a Windows 2003 server into an Hyper-V environment with Disk2VHD. In the physical server I am able to do this:
I am able to see the content of netlogon.
When I do that in the virtual system (exact 100% the same Windows / setting / etc. offcourse) I get:
\\servername\netlogon is not accessible. You might not have the right permissions for this network location. Contact system administrator.
I do not get this permissions error since I cloned the physical to virtual, so everything should be exactly the same.
Try using IP address for Server Name.