Logoff Portal users beyond a certain number

Dear All,
We are interested to implement a solution wherein if the number of users increase to a particular number say 5000 in portal, they are automatically logged off. I heard that this can be done by customizing the header module file com.sap.navigation.masthead. par. Can someone help in this regard.
Please note that we have already tried to restrict users by defining 300 max. users per server node as well as from the load balancer but still the portal is not able to take the load.
Thanks
Ankur

Hi Ankur,
But at the same time a user may have multiple sessions running on a server node.
Regards,
Biroj...

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package com.hcl;
import com.sap.security.api.ISearchResult;
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Function module to get employee details by passsing user name
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IF lt_ee_tab[] IS NOT INITIAL.
Passing employee number to export parameter
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ENDIF.
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Logoff Portal users beyond a certain number

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