We deployed public facing site using SharePoint 2010 foundation, this site is accessed by both anonymous public user and internal user with Window authentication.
By default the SP 2010's sign-out is not clearing the session(persistent cookies) after user sign-out, we wrote custom code to clear the cookies but even then users able to login with other tab without closing the browser. Forcing user to close the browser is not accepted by customer so looking for alternate. We are thinking to propose Claim based authentication with STS, is this resolve the problem if not what is possible option. We don’t have time to try POC for Claim based authentication.