User Manual

5Rack ATS AP44xx User Manual
Types of User Accounts
The Rack ATS has various levels of access (Super User, Administrator, Device User, Read-Only User,
and Network-Only User), which are protected by user name and password requirements. Up to four
users are allowed to log on to the same Rack ATS simultaneously.
• An Administrator or the Super User can use all of the menus in the Web UI and all of the
commands in the CLI. Administrator user types can be deleted, but the Super User cannot
be deleted. The default user name and password for the Super User or an Administrator are
both apc.
NOTE: The Super User or an Administrator can manage another Administrator's account
(enable, disable, change password, etc).
• A Device User has read and write access to device-related screens. Administrative functions like
Session Management under the Security menu and Firewall under Logs are unavailable.
• A Read-Only User has access to the same menus as a Device User, but without the ability to
change configurations, control devices, delete data, or use file transfer options. Links to
configuration options are visible but disabled. The event and data logs display no button to clear
the log. The default user name for this account is readonly, and the default password is apc.
• A Network-Only User can only log on using the Web UI and CLI (Telnet or SSH). A user with
network-only access has read/write permission to the network related menus only.
Watchdog Features
To detect internal problems and recover from unanticipated inputs, the Rack ATS uses internal, system-
wide watchdog mechanisms. When it restarts to recover from an internal problem, a Network Interface
Restarted event is recorded in the event log.
Network interface watchdog mechanism
The Rack ATS implements internal watchdog mechanisms to help protect itself from becoming
inaccessible over the network. For example, if the Rack ATS does not receive any network traffic for 9.5
minutes (either direct traffic, such as SNMP, or broadcast traffic, such as an Address Resolution Protocol
[ARP] request), it assumes that there is a problem with its network interface and restarts. The network
interface watchdog mechanism is only enabled on an ATS that discovers an active network interface
connection at start-up.
Resetting the network timer
To help ensure that the Rack ATS does not restart if the network is quiet for 9.5 minutes, the Rack ATS
attempts to contact the default gateway every 4.5 minutes. If the gateway is present, it responds to the
Rack ATS, and the response restarts the 9.5-minute timer. If your application does not require or have a
gateway, specify the IP address of a computer that is running on the network and is on the same subnet.
The network traffic of that computer should restart the 9.5-minute time frequently enough to prevent the
Rack ATS from restarting.