Open and enter the Virus & threat protection menu.
The "Lumion 12 is being prevented from contacting the license server" error stems from a variety of potential causes, from security software conflicts and network issues to the critical pending licensing system updates. By systematically working through these diagnostic steps—paying particular attention to registering your license with a Lumion Account—you can resolve the issue and restore normal operation to your software. The most important immediate action for all Lumion 12 and older version users is to ensure their license is linked to a Lumion Account before the end of November 2025 to guarantee continued functionality with the new licensing infrastructure. Open and enter the Virus & threat protection menu
: Type "cmd" in the Windows search bar, right-click Command Prompt , and choose Run as administrator . Flush DNS : Type ipconfig /flushdns and press Enter . Reset Winsock : Type netsh winsock reset and press Enter . The most important immediate action for all Lumion
Check your antivirus protection history . If you see Lumion files there, click Restore . 3. Clean Your "Hosts" File Reset Winsock : Type netsh winsock reset and press Enter
Keep your system time synchronized automatically and verify it regularly.
Lumion requires access to Port 80 (HTTP) and Port 443 (HTTPS) for the following domains: *.lumion3d.net licenses.lumion3d.net services.lumion3d.net backup.lumion3d.net 4. Cleaning the "Hosts" File