PRB: 'Permission Denied' calling window.external.isSubscribed()

• Internet Client SDK, version 4.0
• Microsoft Internet Explorer (Programming), version 4.0

SYMPTOMS

Calling window.external.isSubscribed() from a script results in a "Permission Denied" error.

CAUSE

This is a side effect of Internet Explorer 4.0's cross-frame security feature where a script running in a document cannot access the unsafe properties or methods of another document which is hosted on a different domain.

STATUS

This behavior is by design.

MORE INFORMATION

The window.external.isSubscribed() method does not refer to the document.domain property. However, window.external.isSubscribed() will correctly determine whether the requested URL is in the same second level domain as the current document.

Two servers inside the same intranet are likely to be affected by this. A document at "http://server1" cannot check for a subscription to "http://server2" even if the two servers are on the same local network.

REFERENCES

For additional information on cross-frame security in Internet Explorer 4.0, please see the following article in the Microsoft Knowledge Base:

   ARTICLE-ID: Q167796
   TITLE     : PRB: "Permission Denied" When Scripting Across Frames

Keywords          : InetSDKInfoDev kberrmsg
Technology        : kbInetDev
Version           : WINDOWS:4.0
Platform          : WINDOWS
Issue type        : kbprb