The Host Access Control policies give you fine-grained control over which users are allowed to log into the UNIX host.
Safeguard Authentication Services supports host access control through the users.allow and users.deny files. Safeguard Authentication Services consults these files to determine whether or not to allow access to a particular user. This is an effective way to restrict access to sensitive computers on the network when using decentralized user accounts such as Active Directory. Group Policy defines policies for management of the access control files.
Host access control entries are "append only" and cannot be overridden. However, if there is a duplicate entry, the entry is only added once to the access control files.