SharePoint Favicon issue - not working in IE8 and IE9 , working on Google Chrome and Mozilla Firefox

We are trying to apply favicon with Sharepoint control and HTML Link tag.

Sharepoint Control
<SharePoint:SPShortcutIcon runat="server" IconUrl="/sampletool/images/favicon.ico"/>

HTML Tag
<link rel="icon" href="/sampletool/images/favicon.ico" type="image/x-icon"/>
<link rel="shortcut icon" href="/sampletool/images/favicon.ico" type="image/x-icon"/>

This code works for Chrome and FireFox, doesnot work in IE 8/9.

Please help. Your help will greatly appreciated.

Thanks,

Divyesh Lappawala