PowerShell Script: Configure Internet Proxy Settings (Per User)

🧾 Purpose:

This script configures Internet Properties (LAN Settings) on a Windows machine using PowerShell. It ensures proxy settings are applied at the user level, bypassing system-wide Group Policy enforcement that prevents changes from reflecting in the Internet Options UI.

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✅ Features:

• Enables per-user proxy configuration (ProxySettingsPerUser)

• Disables "Automatically detect settings"

• Enables "Use a proxy server for your LAN"

• Sets a custom proxy server address and port

• Enables "Bypass proxy server for local addresses"

• Refreshes Internet Settings to apply changes

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⚠️ Prerequisites:

• Must be run as Administrator

• Intended for Windows systems with access to modify the registry

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📂 Registry Paths Used:

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💻 Script:

powershellCopyEdit# Allow per-user proxy settings by enabling ProxySettingsPerUser
$machineRegPath = "HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings"
if (-Not (Test-Path $machineRegPath)) {
    New-Item -Path $machineRegPath -Force | Out-Null
}
Set-ItemProperty -Path $machineRegPath -Name ProxySettingsPerUser -Value 1 -Type DWord

# Define user-specific proxy settings
$proxyAddress = "http=your.proxy.url:8080"  # Replace with your actual proxy
$userRegPath = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings"

# Apply the proxy settings
Set-ItemProperty -Path $userRegPath -Name AutoDetect -Value 0                     # Disable "Automatically detect settings"
Set-ItemProperty -Path $userRegPath -Name ProxyEnable -Value 1                   # Enable proxy
Set-ItemProperty -Path $userRegPath -Name ProxyServer -Value $proxyAddress       # Set proxy server
Set-ItemProperty -Path $userRegPath -Name ProxyOverride -Value "<local>"         # Bypass for local addresses

# Optionally refresh Internet settings for immediate effect
rundll32.exe inetcpl.cpl,ClearMyTracksByProcess 4351

Write-Host "Proxy settings applied. UI should now reflect the changes."

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🧪 Post-Execution Verification:

1. Open regedit and confirm changes under:

   • HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings

   • HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings

2. Launch Internet Properties → Connections → LAN Settings

   • "Use a proxy server" is checked ✅

   • Proxy server address is set ✅

   • "Bypass proxy for local addresses" is checked ✅

   • "Automatically detect settings" is unchecked ✅

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📌 Notes:

• ProxySettingsPerUser=1 is crucial to allow user-level changes and avoid the "Some settings are managed by your system administrator" warning.

• Changes apply instantly in most cases; if not, log off/log on or restart browser applications.

Step 1: Enable per-user proxy settings

powershellCopyEdit$machineRegPath = "HKLM:\Software\Policies\Microsoft\Windows\CurrentVersion\Internet Settings"
if (-Not (Test-Path $machineRegPath)) {
    New-Item -Path $machineRegPath -Force | Out-Null
}
Set-ItemProperty -Path $machineRegPath -Name ProxySettingsPerUser -Value 1 -Type DWord

• What’s happening?

  • The first part checks if a specific setting (called ProxySettingsPerUser) exists in a special part of your system’s configuration, called the registry.

  • Why? This setting decides if you can change proxy settings just for your own user (which we want) or if they are locked for everyone on the computer.

  • If it doesn’t exist, the script creates it. Then, it sets the value of ProxySettingsPerUser to 1, which means yes, you are allowed to modify your own settings.

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Step 2: Define proxy server settings

powershellCopyEdit$proxyAddress = "http=your.proxy.url:8080"  # Replace with your actual proxy
$userRegPath = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings"

• What’s happening?

  • Here, we’re telling the script the proxy server’s address and port (like http=your.proxy.url:8080).

  • The $userRegPath is the path where your individual (user) settings are stored in the registry. This is where we’ll apply the actual proxy settings.

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Step 3: Apply the actual proxy settings

powershellCopyEditSet-ItemProperty -Path $userRegPath -Name AutoDetect -Value 0                     # Disable "Automatically detect settings"
Set-ItemProperty -Path $userRegPath -Name ProxyEnable -Value 1                   # Enable proxy
Set-ItemProperty -Path $userRegPath -Name ProxyServer -Value $proxyAddress       # Set proxy server
Set-ItemProperty -Path $userRegPath -Name ProxyOverride -Value "<local>"         # Bypass for local addresses

• What’s happening?

  • The Set-ItemProperty command is where we are actually setting or modifying the settings.

  • The settings are for:

    1. AutoDetect: We turn off the "Automatically detect settings" option (by setting it to 0), so Windows won’t try to guess the proxy.

    2. ProxyEnable: We turn on the proxy by setting it to 1.

    3. ProxyServer: We tell the computer the address and port of the proxy server.

    4. ProxyOverride: We tell the computer to bypass the proxy for local addresses (like your local network).

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Step 4: Refresh the settings immediately

powershellCopyEditrundll32.exe inetcpl.cpl,ClearMyTracksByProcess 4351

• What’s happening?

  • This command forces a refresh of Internet Settings, so the changes take effect right away. It’s like telling your computer to clear any old settings and reload the new ones you just applied.

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Final Message:

powershellCopyEditWrite-Host "Proxy settings applied. UI should now reflect the changes."

• What’s happening?

  • The script prints a message to the screen, telling you that the proxy settings have been applied successfully.