PowerStore: Unable to use SDNAS SMB shares for Windows RDS User Profile Disks

Summary: In Windows, User Profile Disks (UPD) for Remote Desktop Services (RDS) can be located on a remote SMB share. However, for SDNAS, and almost all non-Windows NAS providers, this functionality is not supported. ...

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Symptoms

Customer impact may show inability to use SDNAS storage for User Profile Disk storage in Microsoft Windows.

How to identify this issue:
Setting the destination of the UPD storage to an SDNAS SMB share the user sees the following error in the Windows client:
  
Could not create the template VHD. Error Message:
Unable to connect to WMI on server
my.nas.server error: The RPC server is unavailable.
(Exception from HRESULT: 0800706BA)
An SMB trace of the traffic shows the following: 
61  20:44:10.069470 21.425088   172.17.28.240   10.54.65.132    DCERPC  172 1   1   117     Bind: call_id: 3, Fragment: Single, 2 context items: IOXIDResolver V0.0 (32bit NDR), IOXIDResolver V0.0 (6cb71c2c-9812-4540-0300-000000000000)
65  20:44:10.069618 21.425236   10.54.65.132    172.17.28.240   DCERPC  140 1   117 85      Bind_ack: call_id: 3, Fragment: Single, max_xmit: 5680 max_recv: 5680, 2 results: Provider rejection, Provider rejection
79  20:44:10.071427 21.427045   172.17.28.240   10.54.65.132    DCERPC  216 1   1   161     Bind: call_id: 2, Fragment: Single, 3 context items: EPMv4 V3.0 (32bit NDR), EPMv4 V3.0 (64bit NDR), EPMv4 V3.0 (6cb71c2c-9812-4540-0300-000000000000)
83  20:44:10.071524 21.427142   10.54.65.132    172.17.28.240   DCERPC  164 1   161 109     Bind_ack: call_id: 2, Fragment: Single, max_xmit: 5680 max_recv: 5680, 3 results: Acceptance, Provider rejection, Negotiate ACK
85  20:44:10.071796 21.427414   172.17.28.240   10.54.65.132    EPM 212 161 109 317 83  Map request, IOXIDResolver, 32bit NDR
89  20:44:10.071867 21.427485   10.54.65.132    172.17.28.240   EPM 120 109 317 173     Map response
...
DCE/RPC Endpoint Mapper, Map
    Operation: Map (3)
    [Request in frame: 85]
    Handle: 0000000000000000000000000000000000000000
    Num Towers: 0
    Tower array:
        Max Count: 4
        Offset: 0
        Actual Count: 0
    Return code: 0x16c9a0d6 <---- #define ept_s_not_registered 382312662
}


Cause

The feature requires specific WMI capabilities which are not provided by non-Windows NAS storage. The same behavior is noted across the industry (Unity, Isilon, NetApp, so on).

Resolution

Workaround: Use Windows Server connected using block to serve out an SMB share for UPD storage.

Affected Products

PowerStore
Article Properties
Article Number: 000209244
Article Type: Solution
Last Modified: 25 Jul 2025
Version:  3
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