Restrictive firewall settings on local networks are known to interfere with our services.
In some cases where firewall settings is causing issues, you and your students may still be able to log in to our services, but parts of the services are interrupted, or behaving in unexpected ways.
If you are connecting to our services using a local network provided by your organization, it is recommended to make sure the following endpoints are whitelisted and reachable from your devices:
*.w3schools.com
*.w3spaces.com
*.w3spaces-preview.com
*.w3sapi.com
*.w3sprofile.com
We recommend visiting our self-test page to check for any potential issues: https://pathfinder.w3schools.com/sys-req-check.html
You can also open a support ticket here: https://support.w3schools.com/
Or, email us directly at: help@w3schools.com