Some web services are incompatible with proxies that scan HTTPS content, and, therefore, it is
recommended that you exempt them from HTTPS scanning. Of these, the Webex service
webex.com is exempted from HTTPS scanning by default.
Some software applications use HTTPS for registration and expect specific certificates from the
systems that are registering. When HTTPS scanning is enabled and the appliance generates its
own certificate, such applications may not operate correctly. Of these, the Windows Vista activation
site, sls.microsoft.com, is exempted from HTTPS scanning by default.
For a complete list of known sites that are incompatible with HTTPS scanning, refer to the section
Managing HTTPS Scanning Exemptions on page 106, and add sites from the list to be exempt
from HTTPS scanning as required.
Related tasks
Configuring Certificate Validation on page 108
Adding a Certificate from a Web Site on page 109
Adding a Root Authority Certificate on page 109
Configuring HTTPS Scanning on page 105
C.6 Images Display as Gray
When images are loaded in a browser or third-party application directly from a blocked or warned
site, the images will be displayed as gray boxes. If a user visits a site that policy blocks or warns
against, the appliance presents a page describing what is happening, but the images are displayed
as gray boxes.
Some third-party applications import images from the web as well. For instance, Microsoft Office
2007 can display and download clip art from the web. But, a site that it pulls images from may be
blocked or warned in the appliance policy. These images will not be displayed in the Clip Art
browser in Office 2007.
To allow access you can right click the image in the browser and add an exception for that site
in Configuration > Group Policy > Local Site List.
Related tasks
Configuring the Local Site List on page 97
Searching Recent Activity on page 181
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