How to Prevent Students from Sideloading HTML Documents?

Before diving into technical solutions, consider looking at your governing policy regarding internet use. Who is responsible for creating the policy? Ensuring there’s a clear guideline on these matters is vital, especially in a K-12 setting. Keep in mind that blocking HTML files could affect students who are working on web development projects, so any actions taken should ideally align with established policies.

If you’re using Active Directory, consider modifying your group policy. You can set a policy like 'Set FileURLAccessAllowed = false' and configure it to block file access where they might be dropping those HTML files. You'll likely need to add a line to your Group Policy Object to block access to all local files, using something like 'reg add "HKLM\Software\Policies\Google\Chrome" /v URLBlocklist /t REG_MULTI_SZ /d "file:///" /f'. Just a heads-up though, this could unintentionally block PDFs if Chrome is set as the default viewer.

Do you have any network-level content filtering set up? It's worth checking your infrastructure and see if there's a way to implement deeper filtering. While this is more of a reactive approach, figuring out what's being accessed could help you block it at the Web Application Firewall. Just be persistent—if they can't access what they want, they might lose interest, which buys you time to create a more solid fix!

To get started, I need a bit more information about your current setup. How are you blocking the browser access right now? Are students launching HTML files in an unapproved browser? If you can clarify that, I might be able to offer better advice!