If Microsoft Internet Explorer is configured to use a proxy auto-configuration (.pac) file, when you browse a secure Web site that contains multiple frames you may receive one of the following scripting error messages:
This issue occurs because Internet Explorer does not correctly evaluate Internet security zones before it finishes processing the .pac file. When this occurs, Internet Explorer may assign a URL to an unexpected zone.
To work around this issue, add the Web site that is affected to the Trusted sites security zone in Internet Explorer. To do this, follow these steps:
Start Internet Explorer.
On the Tools menu, click Internet Options.
On the Security tab, click Trusted sites, and then click Sites.
In the Add this Web site to the zone box, type the URL of the Web site that is affected, and then click Add.
Note You can also configure Internet Explorer settings by using Group Policy. For more information about how to do this, visit the following Microsoft Web site:
You can configure Internet Explorer to use a .pac file to specify the proxy server that must be used to access a URL. Just as Internet Explorer uses the proxy exception list, Internet Explorer uses the .pac file to determine the zone for a URL. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
884430 Your home page is assigned to the incorrect security zone if Internet Explorer uses a proxy auto-configuration (.pac) file to specify proxy settings