Microsoft Updates 10/13/09 Kill Vintela SSO w/ Kerberos

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Are we the only group that has Vintela SSO configured with Kerberos encryption on Windows servers and whose client PCs using Internet Explorer have started to display HTTP Status 500...Channel binding mismatch? We see NOTHING on the web or in any of the forums on this. Client PCs effected have the Microsoft Updates of 10/13/09 applied (especially KB974455).

We have:

- Business Objects Enterprise XI 3.1 with FixPack 1_7

- Windows 2003 Servers for the Vintela and Business Objects Enterprise installation and authentication. On the client side, any version of IE (6, 7, 8) is impacted as soon as the Microsoft Updates are applied (removing KB974455 seems to clear up the problem, but it is a combination of updates that need to be in place for it to occur).

Manual login is not impacted (thank goodness), but we'd much prefer SSO. Suggestions?