[newbie] Security Level

[DPRJ Sistemas - Suporte]

Hello!   I have configured my mandrake version 10.1 using higher option on security settings.   After this I could not acces the machine anymore (this was solved changing all tcp_wrappers to all).   Unfortunatelly I still have a problem. My DNS configuration is seen only within the network. Despite of having been changed two days ago my domain is not seen outside my network. If I change the security level to high everything works fine but not using security level higher.   Because of this my home pages and e-mail are not working. I believe that there is an options that must be changed in security using higher option to solve this problem.   Does anyone know which option is that?   Thank you all   Deleo