Step 1 - Thaw the affected computers in Deep Freeze. Instructions for this process are found here: Deep Freeze (PC) 

Step 2 - Check the ethernet plug is connected to the computer and that the lights are on and green or orange (not red). If they are off there is no connection. Try unplugging and securely plugging the ethernet cord back into the back of the computer. If this resolves the issue, apply this to all affected computers and freeze them in Deep Freeze.

Step 3 - If the ethernet cable still does not cause the ethernet port LEDs to light up after being reconnected, contact your school IT because there is most likely an issue with the network itself, not the computer. 

Step 4 (Only applies to labs with a SmartLab server) - If the ethernet port lights up properly, but there is still no internet connection, check that the computer is on the domain. Hover your mouse over the network logo on the bottom right of your Windows taskbar and confirm that a domain name in this format is shown: XXX-SmartLab.Local (where XXX are the school initials). If the domain name is not shown, follow the steps in this article to reconnect to the domain: Adding Computer to the Domain 

If these instructions do not resolve the issue, you may contact Technical Support at support@clsonline.com or continue to advanced troubleshooting below

Advanced Troubleshooting: 

Step 1 - Log into the workstation and try pinging the server by IP or name (server name is typically the (school initals)-cls-server).

Step 2 - Check the subnet mask and confirm it's in the same range (typically the first 3 octets will be the same, the last one will be different).

Step 3 - If the computers are not in the same subnet, the School's IT needs to correct it.

Step 4 - If all else fails and the IT at the school looked at the connection and internal firewall and ACL, etc. that could be blocking the traffic, the Ethernet port is bad and we recommend using a USB to ethernet adapter.