SMB Read Andx requests for files managed by Data Deduplication error in Windows Server 2012: The request is not supported

This article helps fix the errors that occur in SMB Read Andx requests for files managed by Data Deduplication.

Applies to:   Windows Server 2012 R2
Original KB number:   2817216


Server: Windows Server 2012 RTM, with volume setting [x] Enable data deduplication
SMB v1 Clients: Windows XP SP3, third-party CIFS clients (Macintosh, Unix Samba)

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

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

Error messages may vary depending on type of access and application accessing file on Server 2012 share with Data Deduplication.

  • Explore: 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.


  • Error Copying File or Folder

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


    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.

  • 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 <DateTime> XPclient 2012Srv SMB NT Create AndX Request, FID: 0xc003, Path: \Test-Dedup-file.pdf
1820 <DateTime> 2012Srv XPclient SMB NT Create AndX Response, FID: 0xc003
AllocationSize: 0
EndOfFile: 51362
1829 <DateTime> XPclient 2012Srv SMB Read AndX Request, FID: 0xc003, 32768 bytes at offset 0
1830 <DateTime> 2012Srv XPclient SMB Read AndX Response, FID: 0xc003, 0 bytes, Error: 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


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 unoptimization job by running the Get-DedupJob PowerShell command

Reported on:

Windows 2012 Deduplication - Access share from Windows XP / 7


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


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 key had been set manually or by some third party software installation:

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

To resolve the Deduplication issue:

Delete the Registry entry "EnableECP"

  1. Reboot


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



    it the steps above don't solve the issue: There may be additional 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 about the PDF files server 2012 RTM deduplication causing PDF file issues

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

Status as of March 8: Response from McAfee Support: We're 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 times that we've 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 19: the KB has been published and should be publicly accessible through the McAfee Knowledgebase. Investigation surrounding the value "enableecp" is on-going.

Windows 7 clients can't access shares on Windows Server 2012 when Data Deduplication is enabled

More information

Info re. Deduplication on Microsoft Server 2012

Introduction to Data Deduplication in Windows Server 2012

Data Deduplication Overview

Data Deduplication Interoperability

Info on ECP:

What's new in driver development

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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