Real time collaboration issue after Kerberos authentication setup

Hi,
We are using SPNego (kerberos) authentication for our portal (EP 7.0 SP10). When user clicks on log off link, he comes back to the portal home page again so there is no way for the user to log off from the portal. I don't see this as a problem for the users who are not having access to collaboration. But for the users having access to collaboration, when they login to the portal second time (before expiry of the first login session which they couldn't close as log off is not working), they get warning stating
"You are logged to the same portal already. Real-time collaboration capabilities will not be available in the current portal session until you terminate the other session and then restart this one by refreshing the browser or logging on again."
How to resolve this?
Helpful answers will be rewarded
Regards,
Chandra

Most people set the logoff link to a URL which contains soem javascript which closes the browser.
Paul

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