Configure proxy and exclusions on MacOS

This guide explains how to configure proxy settings and exclusions on MacOS when using an IP-based proxy, including an exclusion list for applications that rely on WebSockets, such as:

• Slack
• Lucidchart
• Figma

These apps often fail behind proxies like Squid, which don't support WebSockets by default.

Manual method (system settings)

1. Navigate to System Settings → Network.
2. Select your active interface (e.g., Wi-Fi).
3. Click Details → Proxies.
4. Under web proxy (HTTP) and secure web proxy (HTTPS):
   • Replaceproxy.company.comwith your proxy IP (e.g.,192.168.1.10)
   • Set port (commonly8080)
5. In bypass domains, add the required domains (see below).
6. Click OK, then Apply.

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What this script does

• Applies proxy settings to all network interfaces
• Sets HTTP and HTTPS proxy
• Configures a list of bypass domains that will not use the proxy
• Ideal for use withnetworksetupand MDM-managed devices

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Scripted method (bash)

#!/bin/bash

# Define proxy server and port
PROXY="192.168.1.10"
PORT="8080"

# Domains to exclude from proxy — especially for WebSocket-based apps
EXCLUSIONS="localhost,127.0.0.1,*.microsoftonline.com,*.core.windows.net,*.slack.com,*.figma.com,*.lucidchart.com,*.lucid.app"

# Get all active network services
services=$(networksetup -listallnetworkservices | tail +2)

# Apply settings per service
for service in $services; do
  echo "Setting proxy for: $service"
  networksetup -setwebproxy "$service" "$PROXY" "$PORT"
  networksetup -setsecurewebproxy "$service" "$PROXY" "$PORT"
  networksetup -setproxybypassdomains "$service" $(echo $EXCLUSIONS | tr "," " ")
done

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