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Thank you for your quick help.
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I'm trying disable access using /etc/access.conf file and still user can access. What am I &nbsp;missing here? &nbsp;This is what I put in access.conf file <br />
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- : david : ALL<br />
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I'm trying disable access using /etc/access.conf file and still user can access. What am I  missing here?  This is what I put in access.conf file 

- : david : ALL



/etc/security/access.conf problem

The Linux operating system, in all its flavors, has its own share of security flaws that allow intrusions, but there are various mechanisms by which these flaws can be removed, generally divided into two parts: authentication and access control. Authentication is responsible for ensuring that a user requesting access to the system is really the user with the account, while access control is responsible for controlling which resources each account has access to and what kind of access is permitted.