Lumion 12 Is Being Prevented From Contacting - The License Server Fix

Try using public DNS services such as Google DNS ( 8.8.8.8 and 8.8.4.4 ) or Cloudflare DNS ( 1.1.1.1 and 1.0.0.1 ).

Open the following file: C:\Windows\System32\drivers\etc\hosts . that contain the word "lumion".

Scroll down to and click Add or remove exclusions . Click Add an exclusion and choose Folder .

: Automated registry cleaning tools often inadvertently sweep away essential licensing path credentials. If you want to troubleshoot this further, let me know: Try using public DNS services such as Google DNS ( 8

Go to > Allow an app through Windows Firewall .

: Go to Windows Security > Firewall & network protection > Allow an app through firewall .

If you are using Lumion 12 or older, this is a mandatory first step. Scroll down to and click Add or remove exclusions

: Ensure you have installed the latest hotfixes for Lumion 12, as developers regularly update licensing certificates to match modern web standards.

has the necessary exclusions in Windows Defender or third-party firewalls. It specifically checks for access to on domains like *.lumion3d.net Hosts File Integrity Check

How to Fix "Lumion 12 is being prevented from contacting the license server" If you want to troubleshoot this further, let

Click the Windows Start menu, type , right-click it, and select Run as administrator .

💡 If these steps don't work, try holding CTRL + SHIFT while double-clicking the Lumion shortcut. Keep holding them until the program starts, as this can sometimes bypass minor startup glitches.

Go to File > Open and navigate to: C:\Windows\System32\drivers\etc\ .

Find , click Add or remove exclusions , and choose Add an exclusion > Folder .