If the error specifically appears when starting Cisco IOL/IOU images, it might be due to an invalid iourc license file.

If network settings are suspected to be incorrect, you can reinitialize the setup by removing the configuration file: rm -rf /opt/virl/etc/configured Then run su - to restart the wizard and re-enter static IP, DNS, and gateway details. 3. Support Resources

Alternatively, if your interface is named differently (e.g., ens160 ):

If you have moved your VM to a different physical machine or changed its virtual MAC address, the original license will no longer be valid.

To avoid ever seeing again:

The computer's name was changed after the license was generated. Are you using a specific software

If manual troubleshooting fails, official documentation and community forums provide further guidance: