ATEN KN Series 32-Port KVM over IP Switch with Dual Power/LAN (1-Local + 4-Remote Access) - Manual (Page 185)

Chapter 8. Device Management
167
Authentication
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Disable Local Authentication
Selecting this option disables login authentication on the KVM over IP
switch. The switch can only be accessed using LDAP, LDAPS, MS Active
Directory, RADIUS or CC Management authentication.
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RADIUS Settings
To allow authentication and authorization for the KVM over IP switch
through a RADIUS server, do the following:
1. Check Enable .
2. Select Preferred or Alternate RADIUS server.
3. Fill in the IP addresses and service port numbers for the Preferred and
Alternate RADIUS servers. You can use the IPv4 address, the IPv6
address or the domain name in the IP fields.
4. In the Timeout field, set the time in seconds that the KVM over IP
switch waits for a RADIUS server reply before it times out.
5. In the Retries field, set the number of allowed RADIUS retries.