Being Prevented From Contacting The License Server — Lumion 12 Is

Windows may block inbound or outbound traffic for newly installed or updated versions of Lumion without notifying you.

Resolving this issue requires systematically checking network permissions, antivirus behavior, and system host files to restore communication with the Lumion Support infrastructure. 🛠️ Step 1: Clean Up the Windows 'Hosts' File

A modified Windows hosts file is a frequent cause of connection issues. If it contains entries pointing Lumion’s domains to local loops (like 127.0.0.1 ), the software will fail to reach the live servers. Windows may block inbound or outbound traffic for

A common cause of connection failure is a modified Windows "hosts" file that redirects Lumion's license server requests to a local or non-existent address. Open as an Administrator .

ipconfig /flushdns nbtstat -r netsh int ip reset netsh winsock reset If it contains entries pointing Lumion’s domains to

If your security suite manages network ports, ensure it opens and Port 443 (HTTPS) for the following domains: Lumion 12 connection issue to server? - Facebook

Scroll down to find on the list. Ensure both the Private and Public checkboxes are ticked. ipconfig /flushdns nbtstat -r netsh int ip reset

With your account in order, the next step is to check your own system. The most common causes for the "prevented from contacting the license server" error are network-related.

Click under Virus & threat protection settings .