Topic: Receiving email and vnc without login

Hi,
I am using chillispot with openwrt in linksys wrt54gl and freeradius server. For webpage it is working fine. Only after I login I can surf them. But without login, I can receive email and also connect to other server outside using vnc client. I think its the iptable issues. Please help me how to configure. I want to block email and vnc also unless user login.
BTW, I am using iptable given by chillispot.