Microsoft KB Archive/175506

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Article ID: 175506

Article Last Modified on 10/2/2003


  • Microsoft Internet Explorer 4.0 128-Bit Edition

This article was previously published under Q175506


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


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.


This behavior is by design.


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.


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

167796 PRB: "Permission Denied" When Scripting Across Frames

Keywords: kberrmsg kbprb KB175506