April 21, 2026 Category: Troubleshooting / Technical Support Reading Time: 4 minutes
Type ipconfig /flushdns and press Enter. You should see a success message.
Encountering a license server error in Lumion 12 can bring a project to a grinding halt. This error typically manifests as a pop-up message stating that the software cannot contact the license server to verify your credentials. April 21, 2026 Category: Troubleshooting / Technical Support
Implement a more robust and flexible licensing system that minimizes disruptions due to connectivity issues.
A: No. Lumion 12 checks the license server at startup and every ~60 minutes. You can lose internet after launch, but you will get the error if you restart the software offline. This error typically manifests as a pop-up message
The irony? You are connected to the internet. Your firewall is (mostly) off. Why is this happening?
Step 2: Configure Windows Defender and Third-Party Firewalls Lumion 12 checks the license server at startup
Change the file type dropdown menu in the bottom-right corner of the open window from Text Documents (*.txt) to . Double-click the file named hosts (ignore hosts.ics ).
John contacted the Lumion support team, reporting the issue and providing details about the problem. They were grateful for his thorough investigation and confirmed that the issue was indeed related to SecurityGuard.
Go to File > Open and navigate to: C:\Windows\System32\drivers\etc\ .