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114Switched Rack PDU User Guide
Troubleshooting
Rack PDU Access Problems
For problems that persist or are not described here, see the back cover of this manual.
Problem Solution
Unable to ping the Rack PDU If the Rack PDU’s Status LED is green, try to ping another node on the same
network segment as the Rack PDU. If that fails, it is not a problem with the Rack
PDU. If the Status LED is not green, or if the ping test succeeds, perform the
following checks:
• Verify all network connections.
• Verify the IP addresses of the Rack PDU and the NMS.
• If the NMS is on a different physical network (or subnetwork) from the Rack
PDU, verify the IP address of the default gateway (or router).
• Verify the number of subnet bits for the Rack PDU’s subnet mask.
Cannot allocate the
communications port through a
terminal program
Before you can use a terminal program to configure the Rack PDU, you must shut
down any application, service, or program using the communications port.
Cannot access the command line
interface through a serial
connection
Make sure that you did not change the baud rate. Try 2400, 9600, 19200, or 38400.
Cannot access the command line
interface remotely
• Make sure you are using the correct access method, Telnet or Secure SHell (SSH).
An Administrator can enable these access methods. By default, Telnet is enabled.
Enabling SSH automatically disables Telnet.
• For SSH, the Rack PDU may be creating a host key. The Rack PDU can take up to
one minute to create the host key, and SSH is inaccessible for that time.
Cannot access the Web interface • Verify that HTTP or HTTPS access is enabled.
• Make sure you are specifying the correct URL — one that is consistent with the
security system used by the Rack PDU. SSL requires https, not http, at the
beginning of the URL.
• Verify that you can ping the Rack PDU.
• Verify that you are using a Web browser supported for the Rack PDU. See
“Supported Web Browsers” on page 52.
• If the Rack PDU has just restarted and SSL security is being set up, the Rack PDU
may be generating a server certificate. The Rack PDU can take up to one minute to
create this certificate, and the SSL server is not available during that time.
Cannot communicate using
Network Port Sharing
• If you are having communications problems with Network Port Sharing, check
that the total length of network cable between up to four units is not more than 10
meters.
• If you are having communications problems with Network Port Sharing, check
that a terminator is installed at both ends of up to four units that can be grouped
together.
• If you are using Network Port Sharing and do not see one or more of the units in
the group, check that all units in the group are using the same firmware revision.
You can download appropriate firmware revisions from the APC website.