Metered Rack PDU User’s Guide2
Types of User Accounts
The Rack PDU has three levels of access (Administrator, Device User, and Read-Only User), which are
protected by user name and password requirements.
• An Administrator can use all of the menus in the Web interface and all of the commands in the
command line interface. The default user name and password are both apc.
• A Device User can access only the following:
– In the Web interface, the menus on the Device Manager tab, the Environment tab, and the
event and data logs, accessible under the Events and Data headings on the left navigation
menu of the Logs tab. The event and data logs display no button to clear the log.
– In the command line interface, the equivalent features and options.
The default user name is device, and the default password is apc.
• A Read-Only User has the following restricted access:
– Access through the Web interface only.
– Access to the same tabs and menus as a Device User, but without the capability 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 is readonly, and the default password is apc.
To set User Name and Password values for the three account types, see “Setting
user access” on page 57.
Watchdog Features
Overview
To detect internal problems and recover from unanticipated inputs, the Rack PDU uses internal, system-
wide watchdog mechanisms. When it restarts to recover from an internal problem, a System:
Warmstart event is recorded in the event log.
Network interface watchdog mechanism
The Rack PDU implements internal watchdog mechanisms to protect itself from becoming inaccessible
over the network. For example, if the Rack PDU 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.
Resetting the network timer
To ensure that the Rack PDU does not restart if the network is quiet for 9.5 minutes, the Rack PDU
attempts to contact the default gateway every 4.5 minutes. If the gateway is present, it responds to the
Rack PDU, 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 subnet. The
network traffic of that computer will restart the 9.5-minute time frequently enough to prevent the Rack
PDU from restarting.
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