Security Warning appears when you try to navigate to a Trusted site from a webpage

(Applies to Windows XP Service Pack 2)


When you attempt to browse to a Trusted or privileged site from another website or webpage, a security warning appears with the following message:

The current web page is trying to open a site in your Trusted sites list. Do you want to allow this?

This is due to the Zone Elevation Blocks implemented by default in Windows XP Service Pack 2. If a user clicks a link which causes the Web site to attempt to navigate to a higher zone, the above message appears. Navigation from one zone to a “higher” zone is blocked. This means that Web pages that automatically call more privileged Web pages fail. Also note that the navigation is blocked to the Local Machine, silently.

Examples

Action Taken

<a href="file:///C:/ToolbarCop.exe">File</a>

Navigation to Local machine is blocked silently

<a href="http://www.google.com">Site</a>

Security Warning appears (if google is in Trusted sites list)

To disable this restriction (in valid cases), you can modify the Internet Explorer security zone settings to allow the application to continue working. You can change the zone elevation setting under for each security zone by setting the registry key 2101 from Disabled to Prompt or Allow. To set this via the User interface, configure the following option in the Custom Level Security dialog

Web sites in less privileged Web content zones can navigate into this zone

To disable this restriction for the Local machine Zone, see article "Unable to open local files from Internet Explorer window?".

For more information on Zone Elevation Blocks in Windows XP Service Pack 2, see Microsoft article: Changes to Functionality in Microsoft Windows XP Service Pack 2 Part 5: Enhanced Browsing Security


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