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DFS: RPC Server is Unavailable

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DFS: RPC Server is Unavailable

Postby guest » Thu Jul 29, 2010 11:27 am

DFS on Server 2003 SP2 (Not R2).

There are currently 4 root targets for the namespace. One of these servers is being decomissioned. However, when I shut down the server (or simply disable the Distributed File System service) I get a "RPC Server is Unavailable" when I try to view the root using the DFS console.

Why is DFS Management seemingly dependant on this Server? Share access isn't affected, users are able to access all of the shares despite that one server being turned off or having its service stopped.

Any help is greatly appreciated, thanks!

*edit* Actually, share access is affected in that it becomes very slow. Almost like it's trying to communicate with the server and timing out as you navigate through folders.
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Re: DFS: RPC Server is Unavailable

Postby guest » Thu Jul 29, 2010 11:27 am

Hi Matt,



Based on the description and the research, when we try to view the DFS root by using DFS management console, if the DFS root server cannot be contacted maybe because of the reason it was shutdown or decommissioned, or the Distributed File System service was disabled, the "RPC Server is Unavailable" error message will occurs in this case.

As for the fact that users are able to access all of the shares despite that one server being turned off or having its service stopped, the users have accessed the DFS root share before, when a client attempts to access a root or link in a stand-alone namespace, or a link in a domain-based namespace, the DFS root server provides a referral to the client, and the DFS clients cached the DFS referral on its system. Next time, when the client access the DFS root share, it will firstly try using the cached DFS root referral to access the target shared folder, if the host of target shared folder is unreachable, the DFS clients will retrieve the referral from DFS root server again and try to find the other accessible DFS target shared folder in this case. It will take some time for the client to find the new target share.

You may run "dfsutil /pktinfo" to show what the DFS client referral.

Please install Windows Server 2003 Service Pack 1 Support Tools on a DFS client first and then you may run Dfsutil command line tool.

Download: Windows Server 2003 Service Pack 1 Support Tools

http://support.microsoft.com/kb/892777


In this case, I would like to suggest that you run the following command to clean the information of the decommissioned DFS root server on the domain controller.

dfsutil /clean /Server:<Decommissioned DFS root server name> /Share:<ShareName>


Meanwhile, please wait for some while to make the Active Directory replication the updated information to all the DCs, and then make all the DFS root servers online and Distributed File System service is started on them. Please monitor if the issue will re-occur.



Moreover, for the fault redundant consideration and high availability of DFS root, it is recommended that you place at least one DFS root server in each site.

You may refer to the following steps to add DFS root server.

1. On the server that will be added as a domain based DFS root target, please create a share that is the same name as the DFS root.

2. From a command prompt please run the following:

dfsutil /addftroot /root:\\<fqdn of domain>\<dfs root> /server:<servername to be added as dfs root> /share:<dfs root share>

For example:

DFS root: root.local\dfsroot

Server to be added: MEMBER1

dfsutil /addftroot /root:\\root.local\dfsroot /server:member1.root.local /share:dfsroot

3. Please reboot the DFS root server and then try to access the Distributed File System snap-in to see if the DFS root is accessible.

For more information about DFS mechanism, please refer to:



How DFS Works
http://technet.microsoft.com/en-us/library/cc782417.aspx



Hope it helps.


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