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Administrator’s Guide

Creating block and accept filters 41

Or you may want to create an exception policy that allows a subset of your users to access content

that is blocked for other users. For example, some organizations configure their content filters to

block access to Job Search and Career Development sites like Monster.com. However, your Human

Resources department may require access to such sites. In this case, you can create an allow exception

for the Job Search and Career Development subcategory and assign the policy to your Human

Resources group.

You can create exception policies for the following types of filters:

• Domains

•URL Patterns

• MIME type blocking

• Content

• Applications

• All Web traffic

When a user tries to access content that is blocked by one of the Barracuda Web Filter filters, the user

receives a block message containing login fields (shown in Figure 3.2). If an exception policy exists

for the blocked content, the user can enter the username and password for the account that was

assigned to the exception policy. After the user enters the correct account information, the Barracuda

Web Filter applies the effective policy for that authenticated user.

HTTPS filtering option

By default, the Barracuda Web Filter does not block or scan SSL (https://) traffic because most Web

traffic is non-encrypted. However, you do have the option to enable HTTPS traffic filtering.

Scope of HTTPS traffic filtering

When the HTTPS traffic-filtering option is enabled, filters created using the following mechanisms

will block HTTPS traffic:

Content filters (both built-in and custom)—When HTTPS filtering is enabled, content filters

specified in the

Content Filters page and the Custom Categories page will also filter HTTPS traffic.

Domain-based filters—When HTTPS filtering is enabled, filters specified in the Domains page will

also filter HTTPS traffic.

URL pattern filters—When HTTPS filtering is enabled, filters specified in the URL Patterns page will

also filter HTTPS traffic for which the hostname portion of the URL matches.

Blocking exceptions—When HTTPS filtering is enabled, HTTPS traffic is included in any exceptions

to the following types of blocking-exception rules that are in effect:

• All Web traffic

• Content category filters (both built-in and custom)

• Domain-based filters

• URL pattern filters

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Barracuda Networks 4 Spezifikationen Seite 41