Log in to your Lumion Account on their official website to ensure your seat is active.

Open your Firewall settings and ensure Lumion.exe is allowed for both Inbound and Outbound rules.

Solving the "Lumion 12 is being prevented from contacting the license server" error typically requires fixing a block in your Windows Hosts file or adjusting your Firewall settings.

Ensure you aren't logged into the same license on a different machine. 🚀 Pro-Tip for Fast Troubleshooting

If you use Norton, McAfee, or Bitdefender, you must manually add the Lumion installation folder to the "White List" or "Exclusions" list.

If you are working in a corporate office, your company’s internal network may be preventing the handshake.

If you are using a VPN, disconnect it and try launching the software again.

To rule out a router issue, connect your PC to a mobile hotspot. If Lumion works, the issue is your local Wi-Fi/Office network settings. ⚠️ Step 4: Verify Your License Status

to automatically clean your Hosts file. Find the specific IP addresses Lumion uses for its servers.