Proxy settings

Quick settings > TV options > Settings > Network & internet > Proxy settings

Enter a valid proxy hostname manually by selecting Manual.

 

Network Configuration - IP settings

Quick settings > TV options > Settings > Network & internet > IP settings

If the connection fails, you can check the DHCP setting of the router.
Alternatively, if you are an advanced user and want to install your network with static IP addressing, set the TV to Static IP.