Configure Proxy and Exclusions Windows

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This guide explains how to configure proxy settings and bypass exclusions on Windows, with attention to IP-based proxy definitions and WebSocket app compatibility.

Common apps that rely on WebSockets:

  • Slack
  • Figma
  • Lucidchart

These can fail when routed through proxies like Squid, which do not support wss:// connections.

What This Script Does

  • Sets a system-wide proxy IP address via PowerShell
  • Applies exclusions for user apps (WinINET) and system services (WinHTTP)
  • Prevents proxy routing for WebSocket-based apps and Microsoft services
  • Supports deployment via Intune, GPO, or manual script execution

Manual Configuration Steps

  1. Launch Control Panel → Internet Options.
  2. Navigate to the Connections tab → LAN Settings.
  3. Enable Use a proxy server.
  4. Set:
    • Address = 192.168.1.10
    • Port = 8080
  5. Click Advanced, then add the domains below to the Exceptions list.
  6. Apply and save.

Scripted Method (PowerShell)

# Define proxy IP and port
$proxyIP = "http://192.168.1.10:8080"

# Define proxy bypass list
$bypassList = "localhost;127.0.0.1;*.microsoftonline.com;*.core.windows.net;*.slack.com;*.figma.com;*.lucidchart.com;*.lucid.app;*.github.com;copilot-proxy.githubusercontent.com"

# Apply proxy for system services
netsh winhttp set proxy $proxyIP ";$bypassList"

# Apply proxy for user apps
$regPath = "HKCU:\Software\Microsoft\Windows\CurrentVersion\Internet Settings"
Set-ItemProperty -Path $regPath -Name ProxyEnable -Value 1
Set-ItemProperty -Path $regPath -Name ProxyServer -Value $proxyIP
Set-ItemProperty -Path $regPath -Name ProxyOverride -Value $bypassList