He opened a terminal window, his fingers flying across the keyboard. He pinged the Lumion license server. Request timed out.

When working on a tight architectural rendering deadline, few errors are as frustrating as opening your software and seeing the message: This issue completely halts your workflow by blocking the software from validating your subscription or perpetual seat.

Sometimes, the issue is on Lumion’s side. Before spending hours troubleshooting, verify:

This comprehensive troubleshooting guide breaks down why this error occurs and provides step-by-step methods to resolve it. Direct Root Causes

The official Lumion support recommends adding an exclusion for Lumion.exe in all third-party firewalls and security software. You should also ensure to add an exclusion for Lumion.exe in Windows Defender Firewall.

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.

Open the Control Panel and navigate to .