Ethernet cable connected but no internet

Go to System Preferences -> Network. Click on 'Advanced' and select 'TCP/IP. Click on the 'Renew lease' button. If this doesn't work then, in System Preferences -> Network, create a new location (you might as well call it "School"), select the new location and then remove all connections except Ethernet from the list on the left and try re-newing the lease again.

An address starting with 169 means your Mac is assigning an IP address because it can't connect to a DHCP server. Have you tried a re-boot? Always worth doing with problems of this nature, cures a panoply of ills! If after a re-boot it's still not working, then in the 'School' location, remove Ethernet and add it back in, effectively re-creating the network connection. Might even be worth re-booting between removing and adding it back in! Come back to us if still not working.

Turn off the Wifi if you have it on. Otherwise your computer'll try to go through Wifi.

i'm having the same problem. When i go to assist me then diagnostics, network settings is yellow, and internet and server are both red. my IP starts with 169 and when i try to make a new location it says i cannot connect to ethernet network automatically. Please help the wifi at my school is terrible.

This fixed the connection for my new modem router.

good tip.

I fixed it in the following way

Network>USB Ethernet >Advance>proxies Tab>Select a protocol to configure >Select Auto Proxy discovery

Please follow the above step and let me know .

Thanks,
Annkit