Symantec Security 5600 Series, Security 5400 Series,Clientless VPN 4400 Series, Руководство администратора

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313 Controlling traffic at the security gateway
Blocking inappropriate content with content filtering
The security gateway looks for the most exact match when checking a URL against content category
lists. Matches with allowed categories take precedence over categories that are denied. Based on the
entry in a list, you can block or allow individual Web pages or entire directories, computers, or
domains. When you enter URLs in the content categories, host names are preferable to IP addresses.
For example, if your deny list contains symantecdomain.com, users are denied access to all URLs in
that domain.
The content categories do not provide a means to allow or deny a particular protocol (for example,
HTTP, FTP, and HTTPS). When a URL is placed in a deny, all connections are uniformly blocked.
To determine in which content categories a URL is listed, you can search for it on the URL Ratings tab.
If you disagree with the categorization of a URL, you can delete the URL from a content category, or
you can move the URL to another category.
Modified URL ratings appear on the URL Ratings tab along with the ratings modification information
and your customized caption.
Prerequisites
None.
To modify the contents of a content category
1 In the SGMI, in the left pane, under Policy, click Content Filtering .
2 In the right pane, on the URL Ratings tab, do one of the following:
■
To set up a new URL rating, click New .
■
To modify an existing URL rating, select the URL rating, and then click Properties .
3 To modify the content category, in the URL ratings properties dialog box, click Modify
4
In the Rating Category Selection dialog box, in the Available Rating Categories list, select the
category to which you want to add the URL, and then click the right-arrow >>
button.
5 In the Selected Categories list, select the category from which you want to remove the URL, and
then click the left-arrow << button.
6
Click OK .
7 In the URL ratings properties dialog box, click OK .
8 Optionally, do one of the following:
■
To save your configuration now and activate later, on the toolbar, click Save .
■
To activate your configuration now, on the toolbar, click Activate .
When prompted to save your changes, click Yes .
Related information
For further information related to this topic, see the following:
■
“URL Ratings tab” on page 650
Table 8-4
Filtering by URL
Filtered URL Effect
www.symantecdomain.com/pics/apr.html Matches this one specific page
www.symantecdomain.com/pics Matches entire directory
www.symantecdomain.com Matches this computer
symantecdomain.com Matches entire domain