If you are working in a corporate office, your company’s internal network may be preventing the handshake.
Open your Firewall settings and ensure Lumion.exe is allowed for both Inbound and Outbound rules.
Change the file type filter (bottom right) from .txt to . Open the file named hosts . If you are working in a corporate office,
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.
Ensure you are actually running Lumion 12. If you recently upgraded to a newer version, the 12.0 license may have been deactivated. Open the file named hosts
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.
Log in to your Lumion Account on their official website to ensure your seat is active. If you recently upgraded to a newer version, the 12
to automatically clean your Hosts file. Find the specific IP addresses Lumion uses for its servers.
Open Command Prompt as Admin and type ipconfig /flushdns , then hit Enter. This clears old connection data.
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