Lumion 12 Is Being Prevented From Contacting The License Server !full! May 2026

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.

Look for any lines containing lumion or backup.lumiontech.net . those lines entirely. Save the file and restart Lumion. 🛡️ Step 2: Configure Windows Firewall

Troubleshoot issues that often follow license errors. Which of these troubleshooting steps Solving the "Lumion 12 is being prevented from

Sometimes your security software identifies the license check as suspicious activity and kills the connection.

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

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

Open Command Prompt as Admin and type ipconfig /flushdns , then hit Enter. This clears old connection data. Ensure you aren't logged into the same license

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

The most frequent cause is an entry in the Windows Hosts file that explicitly blocks Lumion’s web address. Open the and type Notepad . Right-click Notepad and select Run as Administrator . In Notepad, go to File > Open . Navigate to: C:\Windows\System32\drivers\etc

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