Getting hit with a license server error just as you’re ready to render can be incredibly frustrating. This specific error in Lumion 12 usually means your computer can't reach the "mothership" to verify you're good to go.
Your firewall might be blocking the specific ports Lumion uses for authentication. Allow the App: Getting hit with a license server error just
End.
Allow Lumion to connect through multiple, globally distributed license servers. This would ensure that if one server is down or experiencing issues, users can seamlessly connect through another. Allow the App: End
If you have tried all the steps above and the error remains, visit the official Lumion Technical Support forum. Provide them with a screenshot of your hosts file and your firewall outbound rules. Usually, a fresh uninstall using a tool like Revo Uninstaller (to scrub the registry) followed by a reinstall is the final nuclear option. If you have tried all the steps above