This page opens when you navigate to Web Filter and click Blocked File Extensions.
The Blocked File Extensions page is where you define File Extension lists to filter. A File Extension list contains extensions the Web module should block when a user attempts to download content matching the list.
The Lightspeed Systems Web Filter includes four predefined File Extension lists: Audio, Compressed, Executable, and Video. Each list contains file extensions for the most common file types in each category. You can add file extensions to each list, or you can create your own lists.
Here are some examples of when you should block file extensions:
- For sites such as Microsoft Update, use the Executable Files list if you do not want users on your network to download and apply updates that have not yet been tested by your local IT administrators
- For sites such as CNN.com, use the Video Files list if you want to allow access to news articles, but not streaming media because of excessive bandwidth usage
You can also create your own lists of blocked file extensions, to block file types not included in the four built-in lists, such as file types that sometimes contain executable code, including macro-enabled document templates (dotm), installer files (msi), script files (vbs, pl, py and others), Windows help files (hlp and chm), registry entries (reg), and so on.