An Active Directory domain or local area network is required to Install ESET Secure Authentication (ESA). The minimum supported functional level for an Active Directory domain is Windows 2000 Native. Only Windows DNS is supported.

If you use a custom DNS in your Active Directory environment, you must create an SRV record in your DNS prior to installing the Authentication Server using the following details:

Type: SRV

Name: _esetsecauth

Protocol: _tcp

Port number: Use the one you configure for Domain port during installation of Authentication Server. Default Domain port number is 8000.

Host: <hostname>:<domain>. If ESA's prerequisite check regarding Active Directory DNS fails, the correct name will display.

Verify the availability of an SRV record by running the following command from a windows computer within your Active Directory environment:

nslookup -type=SRV _esetsecauth._tcp

At least one instance of Authentication Server is essential in your domain/network, select it during first installation of ESA on your server (main computer). Should you select a component that cannot be installed, the installer will inform you of the exact prerequisites that are outstanding.

ESA components can communicate with the Authentication Server via both IPv4 and IPv6. RADIUS server communicates only through IPv4 with RADIUS clients.