Client Host Access Control Dialog Box
Use this dialog box to add client hosts to your allow or deny list. You can use either domain names or IP addresses to specify hosts. For either, you can use regular expressions to specify an expression that matches one or more hosts.
Use a backslash before characters in the domain name that have a special meaning in regular expressions. For example, the backslashes in the sample that follows ensure that dots in the domain will be matched exactly, and not be treated as a wildcard characters:
The options are:
Note: The resolved domain name for a client is always the fully qualified domain name. This means that when you add a host to the allow or deny list using a domain name, you must either use a fully qualified domain name, or a regular expression, to ensure that host domain names are handled correctly. For example, if you deny access to the client "mypc", the client mypc.myhost.com will be able to connect. You must explicitly deny access to "mypc\.myhost\.com" or use an expression such as "mypc\..*" to ensure that this client is denied access.