OWA 2013 Timeout doesn't logout in IE

We are trying to get the inactivity timeouts to work with our exchange 2013 environment. With the irule below from page 111 of the deployment document and using Forms Based Authentication it works for Chrome and Firefox, but IE and Safari will not logout until you refresh the page. Does anybody have any thoughts on how to fix this or add to the irule to force it to refresh the page after the timeout?

when RULE_INIT { set static::cookie_sessionid [format "sessionid=null; path=/; Expires=Thurs, 01-Jan-1970 00:00:00 GMT;"] set static::cookie_cadata [format "cadata=null; path=/; Expires=Thurs, 01-Jan-1970 00:00:00 GMT;"] set static::cookie_usercontext [format "UserContext=null; path=/; Expires=Thurs, 01-Jan-1970 00:00:00 GMT;"] }

when ACCESS_SESSION_STARTED { if { [string tolower [HTTP::uri]] contains "ua=0" } { ACCESS::session remove } }

when ACCESS_ACL_ALLOWED { set apm_mrhsession [HTTP::cookie value "MRHSession"] if { [table lookup $apm_mrhsession] == "EXCHANGE_LOGOUT" } { ACCESS::session remove table delete $apm_mrhsession } }

when HTTP_REQUEST { set isset 0 if {[string tolower [HTTP::uri]] starts_with "/owa" } { if {[string tolower [HTTP::uri]] contains "logoff" } { ACCESS::session remove HTTP::respond 302 Location "https://[HTTP::host]/vdesk/hangup.php3" "Set-Cookie" $static::cookie_sessionid "Set-Cookie" $static::cookie_cadata "Set-Cookie" $static::cookie_usercontext } else { if { [string tolower [HTTP::uri]] contains "ua=0" } { set mrhsession [HTTP::cookie value "MRHSession"] set isset 1 } } } }

when HTTP_RESPONSE { if { $isset == 1 } { if { $mrhsession != "" && [HTTP::status] == 440 } { table set $apm_mrhsession "EXCHANGE_LOGOUT" return } } }