Error code: 406 appears on Acer notebooks because Acer Always Connect is incompatible with the firewall or anti-virus software you are currently using.
Solution: Some anti-virus software and/or firewalls will block the network adapter at the network adapter level Filter Internet traffic. If you encounter this error, please update your antivirus and firewall software/firmware. If this error message still occurs, you may need to reconfigure your firewall (see the user documentation that came with your firewall).
Note: The anti-virus software and firewall software pre-installed on Acer PCs have been tested and are fully compatible with Acer Always Connect.