Lumion 12 Is Being Prevented From Contacting The License Server Jun 2026

If you are trying to download or install Lumion, you also need to add exclusions for the installer file Lumion_[version]_Download.exe and the installer folder (Windows default: C:\Users\[yourWindowsUsername]\Downloads ) in all third-party firewall, antivirus, and security software.

If you are still experiencing issues, double-check that your internet browser can successfully load standard web pages, and verify with your office IT administrator that port 443 (HTTPS) is fully open on your office router.

Try these solutions in order. Test Lumion after each step. If you are trying to download or install

The process is similar but varies by program. Add an exception for the same items:

One of the most frequent causes of this error is a modified Windows hosts file. If Lumion was previously blocked or if a third-party script modified your network routing, it will hard-stop any connection to the license server. Click the Windows Start menu and type . Right-click Notepad and select Run as administrator . Test Lumion after each step

Before diving into the solutions, it's essential to understand the possible causes of the issue:

Below is a step-by-step guide to diagnosing and fixing the issue so you can get back to rendering. 1. Clean the Windows Hosts File If Lumion was previously blocked or if a

Keep Domain, Private, and Public checkboxes marked, click Next , name the rule "Lumion 12 Outbound", and click .

Use the "Allow an app through Windows Firewall" setting and manually add Lumion.exe .