Depending on the version of SSH that you are using, one or two kinds of access control can be setup on this page.

For host based access control, you can allow or deny hosts by entering a list of hostnames (like `www.foo.com`), IP addresses or hostname patterns (like `*.foo.com`). This kind of access control is not supported by all SSH server versions though.

For user or group based access control, user names can be either local login accounts (like `jcameron`), account patterns (like `jcam*`) or a combination of login and client hostname (like `jcameron@www.foo.com`). Allowed or denied groups can also be plain group names or group name patterns, but cannot include hostnames.