Create an exception in the web content filter for the web address used by the Desktop Authority Update Service.
The web address for the Update Service is http://webservices.scriptlogic.com/services/7.5RC1/UpdateServices/Webupdate.aspx. You can find it by navigating to the following registry location on the update server: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\UpdateService\UpdateWebsite.
NOTE: Technical Support does not provide support for problems that arise from improper modification of the registry. The Windows registry contains information critical to your computer and applications. Make sure you back up the registry before modifying it. For more information on the Windows Registry Editor and how to back up and restore it, refer to Microsoft Article ID 256986 “Description of the Microsoft Windows registry” at Microsoft Support.