Gatekeeper
See steps in Install: System Settings → Privacy & Security, or Open from the context menu. Download only from the official Download page.
Port in use
- Stack → Diagnostics /
macstack doctor --stack - Find the process on the port (
lsof -i :8088,:8443,:3306, …) - Stop the other Apache/nginx/MySQL or change ports in Settings → Ports
- Save and restart
Typical conflicts: another stack on 8088/8443, system Apache if you switched to 80, old Valet/Herd, another Docker Compose stack.