Open your Firewall settings and ensure Lumion.exe is allowed for both Inbound and Outbound rules.
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. Open your Firewall settings and ensure Lumion
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
Change the file type filter (bottom right) from .txt to . Open the file named hosts . ⚠️ Step 4: Verify Your License Status to
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 are actually running Lumion 12. If you recently upgraded to a newer version, the 12.0 license may have been deactivated. Open the and type Notepad
If you use Norton, McAfee, or Bitdefender, you must manually add the Lumion installation folder to the "White List" or "Exclusions" list.