About Domains In addition to a built in LocalDomain with a LocalAuthServer for authentication of users, GMS is able to access and authenticate against popular third-party systems including Active Directory, RADIUS and LDAP in a transparent fashion. By default, GMS maintains its own locally stored database for authentication purposes. This is also referred to as the “LocalAuthServer.” GMS also allows simultaneous third-party database authentication that makes use of your existing (and separately maintained) database system(s). NOTE: Although GMS supports the use of multiple external authentication mechanisms for a single domain, only one instance of a local GMS authentication server — the default GMS “LocalAuthServer” — can exist for each domain. The user hierarchy of your database (either GMS or third-party) determines what a user’s view consists of, and what data they are able to access and/or modify. In the case of Active Directory servers, GMS has the ability to limit access to only specified groups of users. If this functionality is desired, the target groups must be specified.