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Barracuda Web Filter Release 3.3

42 Chapter 3: Configuring, Monitoring, and Managing the Barracuda Web Filter

Limitations for HTTPS traffic filtering

When the HTTPS traffic-filtering option is enabled, the following limitations apply:

• If HTTPS access is denied, the user is not presented with a block page because the traffic is

blocked at Layer 3.

• If HTTPS access to a particular domain name is denied, HTTPS access to any subdomain of

that same domain will also be denied for the same users.

• For any filtering policy that is set to Warn, the HTTPS request is Blocked instead.

• For URL pattern filters, only the unencrypted portion of the requested HTTPS URL can be

checked for a match with the specified pattern.

To enable the HTTPS traffic-filtering option

To expand your HTTP filtering policies to include HTTPS filtering, enable the HTTPS Filtering

option in the

BLOCK/ACCEPT > Configuration page.

Note:

Immediately after you enable this option, any client machines that had previously established

an HTTPS session are communicating with an IP address and will not be blocked. In this situation, the

HTTPS Web site IP address remains in the DNS client resolver cache (as well as in the DNS table on

the core router or domain controller) until the DNS request time-to-live (TTL) expires. This can take up

to a day or two, depending upon how the HTTPS sites configure TTL.

Testing Web site access

To determine if a specific Web site is allowed or blocked, based on the filters you set up, go to the

BLOCK/ACCEPT > Browse Test page to perform a URL test.

Enter the URL in the field provided, and click

Go. If the Web site appears in the display area on that

page, then your users will be able to access the site. If you receive a message that the Web site has

been blocked, then your users will not be able to access the site.

It is recommended that you make a list of the sites you want to block and allow, and then use the

Browse Test page to test each URL and verify the filters have been set up correctly.

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Barracuda Networks 4 Especificaciones Pagina 42