Prevented From Contacting The License Server ((new)) | Lumion 12 Is Being

Troubleshooting: Lumion 12 Connection to License Server Seeing the error message "Lumion 12 is being prevented from contacting the license server" can bring your project to a grinding halt. This usually happens because your computer’s security settings or network configuration are blocking Lumion's communication with the Lumion authorization servers.

Troubleshooting: "Lumion 12 is being prevented from contacting the license server" Windows Defender Firewall :

4. Diagnostic Steps to Confirm

Step 1 – Test connectivity manually

Open Command Prompt as Administrator and run: Windows Defender Firewall :

Part 2: Immediate Checks (The Low-Hanging Fruit)

Before diving into complex settings, perform these three rapid checks. Windows Defender Firewall :

The little circle spun. The storm outside howled, rattling the windows.

Open Windows Security > Virus & threat protection > Manage settings.

6. DNS Cache Issues

Occasionally, your computer saves an old path to the Lumion server (DNS cache) that is no longer correct. Flushing the DNS cache forces your computer to find the correct server address again.

5. Recommended Fixes

✅ For home users:

1. Windows Defender Firewall: