Cannot create DFS Namespace - RPC server unavailable

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I have a test lab of Hyper-V machines.

1 DC and 2 server 2008 members - all running 2008 R2

I am trying to crate a DFS namespace on the DC.

I have installed the File Server role with DFS and File Server Resource Manager roles also installed.

I didnt create a namespcae when installing DFS i chose the option to create 1 later

When trying to create a domain-based namespace on the DC from the Namespace node in Server Manageri get the following error on the Namespace Type page of the New Namespace Wizard:

Working: Validating Input

Error: \\\DFSTest: The namespace cannot be queried. The RPC server is unavailable

I have tried the following:

1. Disabled firewall incase it was blocking RPC traffic.
2. Checked all RPC services are actually running
3. Removed a namespace1 entry that appeared from Namespaces node in SM, ADSIedit and the registry as per these links

I cannot find anything else out about this.

Anybody have any suggestions on what i can try next?

Id like to remove the DFS role but i cannot as i have to remove AD first to do so!


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Try using the RPC ping utility, its located at this following link: 
It might shed some light on why your getting this error...


I dont have exchange installed NFMC on any of the servers.

ensure the distributed file system service is started.
Removed AD services and recreated DC tried DFS again and this time worked. Something must have went wrong in the original AD setup.

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