Web Filter 3

Blocked File Extensions

Blocked File Extensions Basics

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.

Adding a Blocked File Extensions List

Note: Blocked File Extensions Lists do not take effect until you assign them to a Rule Set.

  • 1. Click Web Filter, then click Blocked File Extensions.
  • 2. On the Blocked File Extensions page, click the green “+” icon. This action opens the following page:

  • 3. In the New File Extensions List form, edit the fields as needed.
  • 4. Click Save to apply your changes, or click Cancel to discard your changes and return to the previous page.

Field Name Description
Name  Enter a name for this Blocked File Extensions List. This name will be added to a dropdown list for each Content Category on the Edit Rule Set page.
Description Enter a brief description for this Blocked File Extensions List.
Extensions List Add extensions for blocked file types to the text box, one entry per line. Wildcards are not supported.

 

Editing a Blocked File Extensions List

Note: Blocked File Extensions Lists do not take effect until you assign them to a Rule Set.

  • 1. Click Web Filter, then click Blocked File Extensions.
  • 2. Click the name to edit the item. This action opens the following page:

  • 3. In the Edit File Extensions List form, edit the fields as needed.
  • 4. Click Save to apply your changes, or click Cancel to discard your changes and return to the previous page.
Field Name Description
Name  Enter a name for this Blocked File Extensions List. This name will be added to a dropdown list for each Content Category on the Edit Rule Set page.
Description Enter a brief description for this Blocked File Extensions List.
Extensions List Add extensions for blocked file types to the text box, one entry per line. Wildcards are not supported.

 

Deleting a Blocked File Extensions List

Note: You cannot delete a Blocked File Extensions List if it has been assigned to a rule set.
  • To delete (permanently remove) an item, mouse over the item you wish to remove, then click the X on the right side of the row. You will be prompted to confirm the action.

Note: Items deleted this way are permanently removed, and cannot be recovered.

Assigning Blocked File Extensions to a Rule Set

Note: Blocked File Extensions do not take effect until you assign them to a Rule Set.

If you have not already done so, create the Blocked File Extensions List.

  • 1. Click Web Filter, then open the Policy Assignments menu and click Rule Sets.

  • 2. Click the name to edit the Rule Set.
  • 3. On the Rule Set page, scroll down to Content Categories.

  • 4. Click to select a File Extension List for the category from the dropdown list on the right side of the grid.
  • 5. Click Save to apply your changes, or click Cancel to discard your changes and return to the previous page.