This error occurs when the software cannot verify your subscription or license key with Lumion’s official servers. It is a common hurdle for users after an update, a change in network security, or a migration to a new workstation. 🛠️ Step 1: Check the Windows Hosts File
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 This error occurs when the software cannot verify
to automatically clean your Hosts file. Find the specific IP addresses Lumion uses for its servers. Open the and type Notepad
If you are working in a corporate office, your company’s internal network may be preventing the handshake. go to File > Open .
If you'd like to dive deeper into a specific area, I can help you:
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 Command Prompt as Admin and type ipconfig /flushdns , then hit Enter. This clears old connection data.