Configure proxy and exclusions Windows

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 supportwss://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