NVP-vProxy: Failed to disable storage migration for virtual machine "vm-****": VDDK Error: 18000: Cannot connect to the host

Summary: NVP- 9.1 vProxy - VM Backups fails with "Error disabling storage migration"

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Symptoms

New installation with IPv6

Environment:
NetWorker 9.1 NVP with vProxy
vCenter and ESX 6.x

All backups fail with 'Cannot connect to host' message: 
2017/01/24 14:44:18 TRACE:  [43] Disabling storage migration of virtual machine "vm-52676" ...
2017/01/24 14:45:18 WARN:   [43] Error disabling storage migration, retrying, error: VDDK Error: 18000: Cannot connect to the host.
2017/01/24 14:48:25 ERROR:  [43] Failed to disable storage migration for virtual machine "vm-52676": VDDK Error: 18000: Cannot connect to the host.
2017/01/24 14:48:25 ERROR:  [43] Error disabling storage migration for virtual machine "VM-AD-5".

 

Cause


Network connectivity to vCenter is over a dual-stack(IPv6 and IPv4) network. The OS(on vProxy) resolves vCenter hostname to its IPv6 address. However, the vProxy does not support dual stack installation

Resolution

Steps to verify the problem:
  1. Log in to vProxy as root
  2. Test lookup: 
    nslookup -q=any vm-vc2.ad.local
    • If answer has any AAAA address i.e. IPv6 address  - then you have verified the problem described in this KB. Proceed with workaround.
    • If lookup does not work- you may need to fix the DNS name resolution. In this case, workaround described below is not needed.
    • If lookup works, however does not have any AAAA address- this indicates a problem with connectivity. Further diagnosis will be needed. In this case, workaround described below is not needed.

Workaround: To setup preference for IPv4 lookups
  1. Log in to proxy as 'root'
  2. Run command to prefer IPv4 lookups :  
    echo "precedence ::ffff:0:0/96  100" >> /etc/gai.conf

Additional Information

If you find the workaround does not resolve the problem- follow these steps to UNDO workaround:
  1. Log in to proxy as 'root'
  2. Edit file: vi /etc/gai.conf
  3. Remove line: precedence ::ffff:0:0/96  100
  4. Save file
Refer to KB Article 000495114 for the error: 
NVP: Error disabling storage migration, retrying, error: VDDK Error: 20005: The operation has been disabled by the guest operating system.

Affected Products

NetWorker Series

Products

NetWorker Series
Article Properties
Article Number: 000056681
Article Type: Solution
Last Modified: 11 Oct 2024
Version:  3
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