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Once you have fixed the error, take these three steps to ensure it never returns:
Before altering your computer settings, verify if the issue is on Lumion’s end. Like all cloud-based licensing systems, Lumion’s servers undergo occasional maintenance or face temporary outages.
Follow these steps in order. Test Lumion 12 after each step.
Lumion needs a direct, unfiltered internet connection to validate its license.
Open a browser. Can you search Google? If your internet is down, Lumion cannot contact the server. Run Windows Network Diagnostics. Once you have fixed the error, take these
If these three fail, proceed to the surgical fixes below.
If you work for a firm with a strict IT department, you will likely not be able to fix this yourself. The error is occurring because your company’s proxy server is intercepting SSL traffic (a "Man-in-the-Middle" for security scans).
What you need to ask your IT admin:
Do not attempt to bypass corporate proxy using VPNs—this usually violates your employment contract and can get you flagged by security. Before altering your computer settings, verify if the
The “prevented from contacting the license server” error sounds alarming, but it’s rarely a serious problem. In 90% of cases, disabling a VPN or adding Lumion to your firewall’s allow list resolves it immediately.
If you’ve tried all the steps above and still see the message, reach out to Lumion Support via your Customer Area. They can verify if your license is correctly registered and provide advanced network logs.
Have a tip of your own? Share it in the comments below or tag us on social media. Happy rendering!
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Before fixing the error, you need to understand why it happens. Unlike older perpetual licenses (Lumion 8, 9, 10), Lumion 12 heavily relies on online validation.
When you launch Lumion 12, the software performs a silent handshake with Act-license (Lumion’s licensing partner). Here is the flow:
If any step in this chain fails, you see the dreaded message. The most common interpretation by users is “My internet is down,” but in reality, the issue is almost always a false positive caused by security software, DNS conflicts, or proxy settings.