Below we have mentioned step by step on "how to allow chrome to access the network in your firewall". You can follow below
Choose System Preferences from the Apple menu.
Click Security or Security & Privacy.
Click the Firewall tab.
Unlock the pane by clicking the lock in the lower-left corner and enter the administrator username and password.
Click "Turn On Firewall" or "Start" to enable the firewall.
Click Advanced to customize the firewall configuration.
If you are still having difficulties then you can visit the website following the above link there to get the complete solution in depth.