Stale Request Error on logout from Gartner

[Chris Woods]

Hi Folks-

We just moved the Gartner SP over to our IDP 4 server and everything works
fine except that we get this when users logout:

Error: Stale Request

You may be seeing this page because you used the Back button while browsing
a secure web site or application. Alternatively, you may have mistakenly
bookmarked the web login form instead of the actual web site you wanted to
bookmark or used a link created by somebody else who made the same mistake.

Left unchecked, this can cause errors on some browsers or result in you
returning to the web site you tried to leave, so this page is presented
instead.
It's not the worst thing ever as it doesn't inhibit the user's access to
the service but sooner or later I expect it will generate a help desk
ticket.

Can anyone point me in the right direction?

Thanks.

-Chris
---
Chris Woods
Systems Administrator
Mount Holyoke College
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