Try:

• Checking the connection
• Checking the proxy and the firewall

Check any cables and reboot any routers, modems, or other network devices you may be using.

If it is already listed as a program allowed to access the network, try removing it from the list and adding it again.

Go to the Chromium menu > Settings > System > Open your computer's proxy settings and make sure your configuration is set to "no proxy" or "direct."