Access Denied when accessing ipc$ but not admin$ of a Windows 2008 R2 Standard server

Question

From a Windows 2008 R2 Server,
c:\> net use * \\<winserver2008>\ipc$ 
System error 66 has occurred.
The network resource type is not correct.
c:\> net use * \\<winserver2008>\admin$ 
Drive Z: is now connected to \\<winserver2008\admin$.
However, running the above commands from a Windows 2003 Server, I have no problem at all.
Does anyone has any idea?

Answer 1

Hello nww,
The problem is caused by UAC and the elevated privileges required to access the administrative shares. This
Microsoft KB article (951016) describes the issue in Windows Vista
To better protect those users who are members of the local Administrators group, we implement UAC restrictions on the network. This mechanism helps prevent against "loopback" attacks. This mechanism also helps prevent local malicious software
from running remotely with administrative rights.
and the steps to resolve it, open a new PowerShell window as administrator:
New-ItemProperty HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System -name "LocalAccountTokenFilterPolicy" -value "1" -propertyType dword
A word of caution: this is opening up a security hole and it should only be done with careful consideration of the risks. The need to use PSExec to remotely run a process was an important part of the deployment, however the same result
could be achieved using PowerShell remoting. Until it’s tested and we’re ready to deploy that, I’ll be using this method.
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