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Goals and Symptoms
Customers have recently been reporting that WebReach stops serving real-time values on client machines which have recently applied Microsoft Critical Security Updates: KB936021 or KB933579, Security Update for Microsoft XML Core Services. These updates are part of Microsoft Security Bulletin MS07-042.
Facts and Changes
MS07-042, Microsoft XML, MSXML Core Services Security Update, WebReach, 936021, 933579
Causes and Fixes
ION Enterprise 5.6, Service Pack 1 will contain modifications that will prevent this incompatibility on new installations and upgrades; however, for existing customers, the following workaround is necessary.
For all current versions of ION Enterprise, a custom HTTP Header which prevents Internet Explorer from caching XML data is required.
On the WebReach server, open Internet Information Services from Start > Settings > Control Panel > Administrative Tools > Internet Information Services.
Expand the right-hand pane to show Default Web Site. Expand Default Web Site, and then expand the virtual directory ION.
The security updates from Microsoft appear to have changed the way that the Internet Explorer caches data from the server. The workaround (and upcoming hotfix) direct Internet Explorer NOT to cache data, and WebReach will operate normally.
For more information on Microsoft Security Bulletin MS07-042, see this link: http://www.microsoft.com/technet/security/Bulletin/MS07-042.mspx.