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.

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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

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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.

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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