Windows Server 2012 - 'The request is not supported.' for SMB Read Andx requests for files managed by Data Deduplication



Server: Windows Server 2012 RTM, with volume setting [x] Enable data deduplication

SMB v1 Clients: Windows XP SP3, 3rd party CIFS clients (MACintosh, Unix Samba)


Windows XP clients are unable to open files on Server 2012 shares

Only deduped files (with the size >32KB) are not accessible on the volume, expanded files are accessible.


Error messsages may vary depending on tpye of access and application accessing file on Server 2012 share with Data Deduplication

 - Explorer: Copy file

  An unexpected error is keeping you from copying the file. If you continue to receive this error, you can use the error code to search for help with this problem.

  Error 0x80070032: The request is not supported.

 German: Datei kopieren

  Aufgrund eines unerwarteten Fehlers können Sie die Datei nicht kopieren. Wenn der Fehler weiterhin ausgegeben wird, können Sie mithilfe des Fehlercodes in der Hilfe nach diesem Problem suchen.

  Fehler 0x80070032: Die Anforderung wird nicht unterstützt.


  Error Copying File or Folder

  Cannot copy <filename>: Cannot read from the source file or disk.


  Datei <filename> kann nicht kopiert werden: Die Quelldatei oder vom Quelldatenträger kann nicht gelesen werden


- Cannot copy <filename>: The request is not supported.


- Office: Microsoft Excel

'filename.xls'  cannot be accessed. The file may be read-only, or you may be trying to access a read-only location. Or, the server the document is stored on may not be responding.


Could not open 'filename.xls'.


- Microsoft Word

Could not open 'filename.doc'.


- Adobe: Open recent file

  There was on error opening this document. Access Denied.

  German: "Adobe:Letzte Datei öffnen

                   Beim Öffnen diese Dokuments ist ein Fehler aufgetreten. Zugriff verweigert.

 - Navisworks

  Autodesk Navisworks Simulate 2011

  Couldn't load <filename.nsd> because the contents are corrupt


- Access Denied


Access is denied.


Network trace shows STATUS_NOT_SUPPORTED for SMB1 Read Andx requests:


1819 2013-02-07 08:20:42 XPclient 2012Srv  SMB NT Create AndX Request, FID: 0xc003, Path: \Test-Dedup-file.pdf

1820 2013-02-07 08:20:42 2012Srv  XPclient SMB NT Create AndX Response, FID: 0xc003

  AllocationSize: 0

  EndOfFile: 51362

1829 2013-02-07 08:20:42 XPclient 2012Srv  SMB Read AndX Request, FID: 0xc003, 32768 bytes at offset 0

1830 2013-02-07 08:20:42 2012Srv  XPclient SMB Read AndX Response, FID: 0xc003, 0 bytes, Error: STATUS_NOT_SUPPORTED

    NTStatus: 0xC00000BB, Facility = FACILITY_SYSTEM, Severity = STATUS_SEVERITY_ERROR, Code = (187) STATUS_NOT_SUPPORTED


Error code 0xc00000bb = STATUS_NOT_SUPPORTED

or 0x80070032 = ERROR_NOT_SUPPORTED = The request is not supported.



Same action on a Windows 7 client with SMBv2 protocol works

- tested on Windows 7 client with SMB2: OK
- tested on Windows 7 client with SMB1: failed (SMB2 disabled using info from KB
2696547 How to enable and disable SMBv1, SMBv2, and SMBv3 in Windows Vista, Windows Server 2008, Windows 7, Windows Server 2008 R2, Windows 8, and Windows Server 2012 ) 


Server 2012 without volume setting [ ] Enable data deduplication

Start-DedupJob E: -Type UnOptimization



Deduplication Cmdlets in Windows PowerShell

Windows PowerShell
Copyright (C) 2012 Microsoft Corporation. All rights reserved.

PS C:\Windows\system32> DedupStatus

Get-DedupStatus - Returns a DeduplicationStatus object for every volume that has data deduplication metadata.
Get-DedupSchedule - Returns the DeduplicationJobSchedule objects defined on the system.
Get-DedupJob - Returns status and information for currently running or queued deduplication jobs.
Update-DedupStatus - Scans one or more specified volumes to compute fresh data deduplication savings information and returns a DeduplicationStatus object.

get the latest status of the un-optimization job by running the Get-DedupJob powershell command


Reported on:



Interoperability issue of components Dedup, SMB and Non-Default entry EnableECP in Server registry:


EnableAuthenticateUserSharing REG_DWORD 0x0

ServiceDllUnloadOnStop REG_DWORD 0x1

ServiceDll REG_EXPAND_SZ %SystemRoot%\system32\srvsvc.dll

NullSessionPipes REG_MULTI_SZ

autodisconnect REG_DWORD 0xf

enableforcedlogoff REG_DWORD 0x1

enablesecuritysignature REG_DWORD 0x0 //default = 0x1

requiresecuritysignature REG_DWORD 0x0

restrictnullsessaccess REG_DWORD 0x1

Lmannounce REG_DWORD 0x0

Size REG_DWORD 0x3

AdjustedNullSessionPipes REG_DWORD 0x3

ClusterPipes REG_MULTI_SZ FssagentRpc

CachedOpenLimit REG_DWORD 0x0 //default = 0x5

>> enableecp REG_DWORD 0x1 << //default = 0x0 or not set

Guid REG_BINARY DEF9D10A080B9241932038A7E77DFC2D

Note: This is known to happen after you install McAfee ver. 8.8 VirusScan Enterprise + AntiSpyware Enterprise.

De-installing this product still leaves enableecp=1 behind, so you need to delete the registry key enableecp manually.



 We believe that the issue is due to interoperability between three components Dedup, SMB and third party like “VMware vShield Endpoint driver (VSEPFLT.SYS)”, if the following registry hey had been set manually or by some 3td party software installation:

HKLM\System\CurrentControlSet\Services\LanmanServer\Parameters\enableecp = 1

To resolve the Deduplication issue:

1. Delete the Registry entry "EnableECP"


2a. Reboot


2b. Restart the Server Service, in elevated CMD window type:


Note, it the steps above do not solve the issue: There may be additonal application related issues:

- when Deduped files are accessed using an application like Adobe over SMB, it may fail.

Adobe confirmed a known issue with Adobe Reader in accessing PDF files on a Server 2012 with Deduped files.

The issue was fixed by Adobe from 10.3.x. Currently the latest version of Adobe Reader available is 11.0.

Here is the article regarding the PDF files

-> This issue is fixed in version (10.1.4) of Acrobat Reader.

Status as of March 8th: Response from McAfee Support : We are actively investigating what the value "enableecp" is used for in our product and what the impact is (if any) of reverting this back to 0 or even removing the value altogether.

If the customer relies on data deduplication on server 2012 accessed by XP clients in their environment, the recommendation for now is, to set the key to 0 as per MSFT suggestion to guarantee smooth operation of the environment until such time that we have finished our investigation and come to a conclusion on how to best approach this issue.

KB77623 – is currently in the pipeline and will be published within the next 5-6 working days, the KB will be updated as our investigation progresses and more details become available. It currently contains a general overview of the issue and the workaround described by MSFT.

March 19th: the KB has been published and should be publicly accessible through the McAfee Knowledgebase ( Investigation surrounding the value “enableecp” is on-going.




More Information

Info re. Deduplication on Microsoft Server 2012

Introduction to Data Deduplication in Windows Server 2012

Data Deduplication Overview  
Data Deduplication Interoperability

Deduplication Cmdlets in Windows PowerShell

Info on ECP:
Extra Create Parameter (ECP) Improvements
Recycling of previously allocated ECPs is new in Windows 8. To avoid the overhead of freeing an ECP on file close and then allocating a new one later, a file system or file system filter driver can reuse an existing ECP.

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