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Description:  

Determines whether the DNS client performs primary DNS suffix devolution in a name resolution process.

When a user submits a query for a single-label name, such as "example", a local DNS client attaches a suffix,
such as "microsoft.com", resulting in the query "example.microsoft.com", before sending the query to a DNS
server.

If a DNS Suffix Search List is not specified, the DNS client attaches the Primary DNS Suffix to a single-label
name, and, if this query fails, the Connection-Specific DNS suffix is attached for a new query. If none of these
queries are resolved, the client devolves the Primary DNS Suffix of the computer (drops the leftmost label of
the Primary DNS Suffix), attaches this devolved Primary DNS suffix to the single-label name, and submits this
new query to a DNS server.

For example, if the primary DNS suffix ooo.aaa.microsoft.com is attached to the non-dot-terminated
single-label name "example," and the DNS query for example.ooo.aaa.microsoft.com fails, the DNS client
devolves the primary DNS suffix (drops the leftmost label) till the specified devolution level, and submits a
query for example.aaa.microsoft.com. If this query fails, the primary DNS suffix is devolved further if it is under
specified devolution level and the query example.microsoft.com is submitted. If this query fails, devolution
continues if it is under specified devolution level and the query example.microsoft.com is submitted. The
primary DNS suffix cannot be devolved beyond devolution level.

If this setting is enabled with appropriate devolution level, DNS clients on the computers to which this setting
is applied attempt to resolve names that are concatenations of the single-label name to be resolved and the
devolved Primary DNS Suffix.

If this setting is disabled, DNS clients on the computers to which this setting is applied do not attempt to
resolve names that are concatenations of the single-label name to be resolved and the devolved Primary
DNS Suffix.

If this setting is not configured, it is not applied to any computers, and computers use their local configuration.

Supported on: At least Windows XP Professional or Windows Server 2003 family.
Primary DNS Suffix Devolution
Description Gpedit Regedit CMD Back VBScript PowerShell Script
Gpedit:   

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Type gpedit.msc and press Enter
In the Group Policy window please navigate to Computer Configuration -> Administrative Templates ->
Network -> DNS Client and open Primary DNS Suffix Devolution.
Not Configured -> is the Default state
Enabled -> apply this GPO
Disabled -> this GPO will not be applied

To finish press ok button and close Group Policy window.
Description Gpedit Regedit CMD Up Back VBScript
Type regedit and press ok
Please confirm User Account Control pop-up
Microsoft official disclaimer

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by
using another method. These problems might require that you reinstall the operating system. Microsoft
cannot guarantee that these problems can be solved. Modify the registry at your own risk.

Note: This registry key is created by Group Policy when this GPO is Enable or Disable. The GPO Default state
is Not Configured -> this registry entry is not present.

Please navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient and
locate
UseDomainNameDevolution registry key
Regedit:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Description Gpedit Regedit CMD Up Back VBScript
Double click on UseDomainNameDevolution and edit the value:

To Enable:
Change the data value with 1

To Disable:
Change the data value with 0

To finish press ok button and close Registry Editor window

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
Description Gpedit Regedit Back CMD VBScript Up
Type cmd, right click on cmd icon under the Programs and click on Run as administrator
Please confirm User Account Control pop-up
Please select, right and copy a registry key from below, then right click on command prompt window
, select Paste and press Enter

Enabled:
REG add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient" /v UseDomainNameDevolution /t REG_DWORD /d 1 /f

Disabled:
REG add "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient" /v UseDomainNameDevolution /t REG_DWORD /d 0 /f

Not Configured:
REG DELETE "HKLM\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient" /v UseDomainNameDevolution /f

Note: Manual editing of this registry key will not be reflected in Group Policy. If you modify this GPO from
Group Policy this registry key will be rewritten.
CMD:          

Please perform the following steps:

Please go to Pearl button (Start) and click on the Search programs and files
For more information about the change from Start to Pearl button click here
Description Gpedit Regedit Back CMD VBScript Up
VBScript:          

Const HKEY_LOCAL_MACHINE = &H80000002
strComputer = "."
Set oReg=GetObject("winmgmts:{impersonationLevel=impersonate}!\\" & _
strComputer & "\root\default:StdRegProv")

strKeyPath = "SOFTWARE\Policies\Microsoft\Windows NT\DNSClient"
oReg.CreateKey HKEY_LOCAL_MACHINE,strKeyPath
strValueName = "UseDomainNameDevolution"
'Enabled
dwValue = 1
'Disabled
'dwValue = 0
oReg.SetDWORDValue HKEY_LOCAL_MACHINE,strKeyPath,strValueName,dwValue
'Not Configured
'oReg.DeleteValue HKEY_LOCAL_MACHINE,strKeyPath,strValueName
Description Gpedit Regedit Back CMD VBScript Up
PowerShell Script :          

Enabled\Disabled

$RegKey = "HKLM:\SOFTWARE\Policies\Microsoft"
If(Test-Path ($RegKey + "\Windows NT"))
{
 $RegKey = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT"
 If(Test-Path ($RegKey + "\DNSClient"))
 {
   $RegKey = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient"
   ##Enabled
   New-ItemProperty -path $RegKey -name UseDomainNameDevolution -value 1 -PropertyType DWord -Force
   ##Disabled
   ##New-ItemProperty -path $RegKey -name UseDomainNameDevolution -value 0 -PropertyType DWord -Force
 }
 else
 {
   New-Item -path $RegKey -name DNSClient
   $RegKey = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient"
   ##Enabled
   New-ItemProperty -path $RegKey -name UseDomainNameDevolution -value 1 -PropertyType DWord
   ##Disabled
   ##New-ItemProperty -path $RegKey -name UseDomainNameDevolution -value 0 -PropertyType DWord
 }
}
else
{
 New-Item -path $RegKey -name Windows NT
 $RegKey = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT"
 New-Item -path $RegKey -name DNSClient
 $RegKey = "HKLM:\SOFTWARE\Policies\Microsoft\Windows NT\DNSClient"
 ##Enabled
 New-ItemProperty -path $RegKey -name UseDomainNameDevolution -value 1 -PropertyType DWord
 ##Disabled
 ##New-ItemProperty -path $RegKey -name UseDomainNameDevolution -value 0 -PropertyType DWord
}

Not Configured

$RegKey = "HKLM:\SOFTWARE\Policies\Microsoft"
Remove-ItemProperty -Path($RegKey + "\Windows NT\DNSClient") -name UseDomainNameDevolution
If( (Get-Item -Path($RegKey + "\Windows NT\DNSClient")).ValueCount -eq 0 -and (Get-Item -Path($RegKey + "\Windows NT\DNSClient")).SubKeyCount -eq 0)
{
 Remove-Item -Path($RegKey + "\Windows NT\DNSClient")
 If( (Get-Item -Path($RegKey + "\Windows NT")).ValueCount -eq 0 -and (Get-Item -Path($RegKey + "\Windows NT")).SubKeyCount -eq 0)
 {
   Remove-Item -Path($RegKey + "\Windows NT")
 }
}
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