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Expanding the Disk of VMs from the Hyper-V Host Using Microsoft Failover Cluster Manager Fails

Applies To

 

Product(s): VMstore 

Product Version(s): All

Bug(s): 40374

Introduction

 

Using Microsoft® Failover Cluster Manager (MSFCM) from individually Hyper-V host to expand the hard disk of VMs stored on Tintri VMstore fails with "The user name or password is incorrect"   

 

Symptoms

 

The following behaviors, conditions and symptoms were observed:

 

  • Expanding the hard disk of VMs from the Hyper-V host using MSFCM fails with 'The user name or password is incorrect'
  • The Hyper-V host Failover Cluster Manager >> Edit Virtual Hard Disk Wizard fails with the following messages when expanding the virtual hard disk:

Edit Virtual Hard Disk Wizard
Unable to edit virtual disk \\SMB share...\********.vhdx
Failed to get the disk information
Failed to open attachment '\\SMB share\...\********.vhdx'
Error 'The user name or password is incorrect.'.

 

Example screenshot of the Edit Virtual Hard Disk Wizard error message:

Edit Virtual Hard Disk Wizard

 

  • The Tintri VMstore debug.log shows the following when the MSFCM makes the request to the VMstore to expand the hard disk:

vmstore[*]: SMB: [*] [*] Smb2SessionSetup: client <<Hyper-V IP Address>>:<<Port>>, ntlmFlags 0xe2088297, clientOs 6.3:9600:0xf000000
vmstore[*]: SMB: [*] [*] Smb2SessionSetup: Denied unsupported NTLM authentication request: client <<Hyper-V IP Address>>:<<Port>>, status 0xC000006D
vmstore[*]: SMB: [*] [*] Smb2SessionSetup: parseInNtlmsspRequest failed: client 1<<Hyper-V IP Address>>:<<Port>>, status 0xC000006D

 

The error message specifies that the user name or password is incorrect and the Hyper-V host is using NTLM for authentication not Kerberos. This is caused by incorrect or missed delegation. The VMstore must have delegation for all the Hyper-V hosts in the cluster.

 ​

 

Resolution

Set up constrained delegation for all Hyper-V hosts in the cluster when using the MSFCM software individually from each Hyper-V hosts to expand the hard disk size of the VMs stored on Tintri VMstore. 

For the procedure to set up constrained delegation: Tintri SCVMM and Hyper-V Setup Guide.

After constrained delegation is enabled on each Hyper-V host the actions to expand the hard disk of the VMs from the MSFCM will complete successfully.

 

Viewing 3 of 3 comments: view all
This link only points to the same article NOT the doc mentioned -"For the procedure to set up constrained delegation: Tintri SCVMM and Hyper-V Setup Guide"
Posted 14:28, 9 May 2017
Labeled as Internal until we can add the proper link to the Doc sited
Posted 14:30, 9 May 2017
Added the link to the Tintri SCVMM and Hyper-V setup Guide in pdf form. WIll remove the INTERNAL surname and have someone verify this new link work correctly to the public.
Posted 13:12, 30 May 2017
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Last modified
13:07, 30 May 2017

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