Set proxy for all users and system accounts on Windows Server

Question

We are trying to deploy a ARM template for Azure. We want to set the proxy for all users and system accounts. But we are unable to do it. When we use this powershell script, the current user has a proxy but not the system account. Any suggestions?

<#
.Synopsis
This function will set the proxy settings provided as input to the cmdlet.
.Description
This function will set the proxy server and (optinal) Automatic configuration script.
.Parameter ProxyServer
This parameter is set as the proxy for the system.
Data from. This parameter is Mandatory
.Example
Setting proxy information
Set-InternetProxy -proxy "proxy:7890"
.Example
Setting proxy information and (optinal) Automatic Configuration Script 
Set-InternetProxy -proxy "proxy:7890" -acs "http://proxy:7892"
#>

#[CmdletBinding()]
Param(        
    [Parameter(Mandatory=$True,ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true)]
    [String[]]$Proxy,

    [Parameter(Mandatory=$False,ValueFromPipeline=$true,ValueFromPipelineByPropertyName=$true)]
    [AllowEmptyString()]
    [String[]]$acs      
)

Begin
{
    $regKey="HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings"        
}    
Process
{        
    Set-ItemProperty -path $regKey ProxyEnable -value 1
    Set-ItemProperty -path $regKey ProxyServer -value $proxy

    if($acs) 
    {            
        Set-ItemProperty -path $regKey AutoConfigURL -Value $acs          
    }

    #$obj = Get-ItemProperty -Path Registry::”HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections"
    #Set-ItemProperty -Path Registry::”HKEY_USERS\S-1-5-18\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections" -Name DefaultConnectionSettings -Value $obj.DefaultConnectionSettings
    #Set-ItemProperty -Path Registry::”HKEY_USERS\S-1-5-18\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections" -Name SavedLegacySettings -Value $obj.SavedLegacySettings
    #$obj = Get-ItemProperty -Path Registry::”HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings"
    #Set-ItemProperty -Path Registry::”HKEY_USERS\S-1-5-18\Software\Microsoft\Windows\CurrentVersion\Internet Settings" -Name ProxyEnable -Value $obj.ProxyEnable
    #Set-ItemProperty -Path Registry::”HKEY_USERS\S-1-5-18\Software\Microsoft\Windows\CurrentVersion\Internet Settings" -Name Proxyserver -Value $obj.Proxyserver
}     
End
{
    Write-Output "Proxy is now enabled"
    Write-Output "Proxy Server : $proxy"

    if ($acs)
    {
        Write-Output "Automatic Configuration Script : $acs"
    }
    else
    {
        Write-Output "Automatic Configuration Script : Not Defined"
    }
}

Answer 1

According to the script above, you've remmed out the keys you need.

You're setting the wrong key. Try this one:

Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\DefaultConnectionSettings

On this key:

HKEY_USERS\S-1-5-18

And you should be golden!

Answer 2

Encoded configuration method

The whole configuration is encoded by the system as binary values and stored in an array under the DefaultConnectionSettings registry value.

Advantage:

• You have only one registry value to handle

Drawback:

• You must create your configuration with an exsting user account in order to get the DefaultConnectionSettings
• You must apply it individually to each user

1.Set the Connection Settings like you desire in your current user session

2.Get the matching value of the Connection Settings from the Currently Logged On User

Get-ItemPropertyValue -Path 'HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections' -Name 'DefaultConnectionSettings'

3.Update the first line of this code with the former result to set the same settings on the System Account

#This is the new connection settings you want to apply
$DefaultConnectionSettings = [byte[]](70,0,0,0,6,0,0,0,5,0,0,0,0,0,0,0,0,0,0,0,39,0,0,0,104,116,116,112,115,58,47,47,119,101,98,112,114,111,120,121,46,109,121,100,111,109,97,105,110,46,99,111,109,47,112,114,111,120,121,46,112,97,99,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0)

#This is the key of the LOCAL SYSTEM account
$IESettingsKey = 'Registry::HKEY_USERS\S-1-5-18\Software\Microsoft\Windows\CurrentVersion\Internet Settings'

$IEConnectionsKey = Join-Path -Path $IESettingsKey -ChildPath 'Connections'

#If the Connection subkey does not exist, create the subkey
If(-not(Test-Path -Path $IEConnectionsKey)){
    New-Item -Path $IESettingsKey -Name 'Connections'
}

try{
    #If the DefaultConnectionSettings already exists, set it with the new value
    $Null = Get-ItemPropertyValue -Path $IEConnectionsKey -Name 'DefaultConnectionSettings'
    Set-ItemProperty -Path $IEConnectionsKey -Name 'DefaultConnectionSettings' -Value $DefaultConnectionSettings
}
catch{
    #If the DefaultConnectionSettings does not exist, create it with the new value
    New-ItemProperty -Path $IEConnectionsKey -Name 'DefaultConnectionSettings' -Value $DefaultConnectionSettings -PropertyType Binary
}

Answer 3

Explicit configuration method

The configuration is a combination of several registry values.

Advantage:

• The configuration is humanly readable.
• The configuration can be applied to all users at once.

Drawback:

• There is no registry value to enable or disable the Automatically detect settings setting

• If you use PowerShell, you have to ensure that the parent registry keys exist and check if the matching values exist or not before you can set the data. For example, when you want to set the AutoConfig value, you must first create the Control Panel registry key (if it does not exist) or you will get an error.

Configuration values:

Note

Values located under
HKLM:\SOFTWARE\Microsoft\Windows\CurrentVersion\Internet Settings
must also be set under
HKLM:\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Internet Settings

• Use automatic configuration script

HKLM:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\AutoConfigURL = URL

Example: http://proxy.mydomain.com/proxy.pac

• Use a proxy server for your LAN

HKLM:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyEnable = 0|1

• Proxy address to use and Use the same proxy server for all protocols checked

HKLM:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyServer = URL:PortNumber

Example: http://proxy.mydomain.com:80

• Use the same proxy server for all protocols unchecked

HKLM:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyServer = List of URL:PortNumber

Example: http://proxy.mydomain.com:80;https://proxy.mydomain.com:443;ftp://ftp.mydomain.com:21

• Bypass proxy server for local addresses and NOTHING in Do not use proxy server for addresses beginning with

HKLM:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyOverride = <LOCAL>

Example: <LOCAL>

• Bypass proxy server for local addresses and SOMETHING in Do not use proxy server for addresses beginning with

HKLM:\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ProxyOverride = FQDN list

Example: Mydomain.com;AnotherDomain.com

Application scope:

• Apply the proxy configuration to all users

HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\ProxySettingsPerUser = 0|1

• Prevent users from overriding Proxy Configuration

HKLM:\Software\Policies\Microsoft\Internet Explorer\Control Panel\Proxy = 0|1