Ensure that Port 80 (HTTP) and Port 443 (HTTPS) are open, as these are required for license validation. 🌐 Step 3: Network and Proxy Settings
Open your Firewall settings and ensure Lumion.exe is allowed for both Inbound and Outbound rules.
Look for any lines containing lumion or backup.lumiontech.net . those lines entirely. Save the file and restart Lumion. 🛡️ Step 2: Configure Windows Firewall Ensure that Port 80 (HTTP) and Port 443
Always ensure you are running the program by right-clicking the icon and selecting This gives the software the necessary permissions to bypass certain local "Read/Write" restrictions that might interfere with the license check.
Change the file type filter (bottom right) from .txt to . Open the file named hosts . those lines entirely
to automatically clean your Hosts file. Find the specific IP addresses Lumion uses for its servers.
If you are using a VPN, disconnect it and try launching the software again. Change the file type filter (bottom right) from
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.