Cannot change DNS settings in Windows Server after adding a new virtual network adapter

Products

• VMware vSphere ESXi

Issue/Introduction

Symptoms:

• After adding a new network adapter to the virtual machine, DNS settings cannot be added or changed within the Windows Server.
• When DNS settings are changed, you see the message:
  
  You must shut down and restart your computer before the new settings will take effect. Do you want to restart your computer now?
  
  Note: DNS settings are lost .
  
  
• Deleting the server DNS record and re-registering DNS has no affect.
• Editing the NameServer parameter for the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\Tcpip\Parameters registry key displays the error:
  
  Cannot edit NameServer: Error writing the value's new contents

Environment

VMware vSphere ESXi 5.0
VMware vSphere ESXi 5.5
VMware vSphere ESXi 5.1

Cause

This issue occurs when an application within the guest operating system is locking the registry.

The lock may be created if there is a security software locking the registry from being changed.

Resolution

To resolve this issue, ensure that network adapters are disabled during configuration.

Additional Information

仮想ネットワークアダプタを新規追加後、Windows Server の DNS 設定を変更できない