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An IT Department might not realize the implications of returning DIRECT from a proxy configuration script and accidentally map the entire untrusted web into the highly-privileged Intranet Zone.

A siteвЂ™s Zone can change at runtime without restarting the browser (say, when moving a laptop between home and work networks, or when connecting or disconnecting from a VPN).

This could lead to a hang and unresponsive UI.

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A synchronous API call might need to know what Zone a caller is in, but determining that could, in the worst case, take tens of seconds - the time needed to discover the location of the proxy configuration script, download it, and run the FindProxyForUrl() function within it.The fact that proxy configuration scripts can push sites into the Intranet zone proves especially challenging, because: Users were often completely flummoxed to find that the same page on a single server behaved very differently depending on how they referred to it - e.g.A Web Developer working on a site locally might find that it worked fine (Intranet Zone), but failed spectacularly for their users when deployed to production (Internet Zone).Zone-mapping heuristics are extra problematic Attempts to automatically provide isolation of cookies and other data by Zone led to unexpected behavior, especially for federated authentication scenarios.Users might manually set configuration options to unsafe values without realizing it.Users might find that their mission critical corporate sites stopped working if their computerвЂ™s Group Policy configuration was outdated.

While powerful and convenient, Zones are simultaneously problematic bug farms: In relatively rare cases, the host application might supply its own Security Manager and override URL Policy decisions for embedded Web Browser Control instances.

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to the Intranet Zone, and if a Proxy Configuration script was used, any sites configured to bypass the proxy would be mapped to the Intranet Zone.ДЄpplications hosting Web Browser Controls, by default, inherit the Windows Zone configuration settings, meaning that changes made for Internet Explorer are inherited by other applications. In particular, the browser would assign dotless hostnames (e.g.

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This allowed Microsoft IT, for instance, to configure the browser with rules like вЂњ Treat as a part of my Intranet and allow popups and file downloads without warning messages.вЂњД«eyond manual administrative or user assignment of sites to Zones, the platform used additional heuristics that could assign sites to the Local Intranet Zone. In corporate or other managed environments, administrators can use Group Policy to assign specific sites to Zones (via вЂњSite to Zone Assignment ListвЂќ policy) and specify the settings for URLActions on a per-zone basis. Reasonable defaults like вЂњ Automatically satisfy authentication challenges from my IntranetвЂќ meant that most users never needed to change any settings away from their defaults. When making a decision, the browser would first map the execution context (site) to a Zone, then consult the setting for that URLAction for that Zone to decide what to do. Users could use the Internet Control Panel to assign specific sites to Zones and to configure the permission results for each zone.

To simplify the configuration for the user or their administrator, the legacy platform classified sites into five 1 different Security Zones:

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In the old Internet Explorer web platform, each of these decisions was called an URLAction, and the ProcessUrlAction(url, action,вЂ¦)В API allowed the browser or another web client to query its security manager for guidance on how to behave. In many cases, decisions are governed by two inputs: a user setting, and the URL of the page for which the decision is being made. As a part of every page load, browsers have to make dozens, hundreds, or even thousands of decisions - should a particular API be available? Should a resource load be permitted? Should script be allowed to run? Should video be allowed to start playing automatically? Should cookies or credentials be sent on network requests? The list is long.