User Manual

UPS Network Management Card 3 User Guide91
Troubleshooting
Network Management Card Access Problems
Visit the Knowledge Base at www.apc.com/support for step-by-step troubleshooting, and helpful solutions to
common issues. To contact customer support, see “APC Worldwide Customer Support”.
Problem Solution
Unable to ping the NMC
If the NMC’s Status LED is green, try to ping another node on the
same network segment as the NMC. If that does not work, it is not a
problem with the NMC. If the Status LED is not green, or if the ping
test succeeds, perform the following checks:
• Verify that the NMC is properly seated in the UPS.
• Verify all network connections.
• Verify the IP addresses of the NMC and the NMS.
• If the NMS is on a different physical network (or subnetwork) from
the NMC, verify the IP address of the default gateway (or router).
• Verify the number of subnet bits for the NMC’s subnet mask.
Cannot allocate the
communications port
through a terminal program
Before you can use a terminal program to configure the NMC, 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 disabled, and SSH is enabled. SSH
and Telnet can be enabled/disabled independently.
• For SSH, the NMC may be creating a host key. The NMC can take
up to one minute to create the host key, and SSH is inaccessible for
that time.
Cannot access the user
interface (UI)
• 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 NMC. SSL requires
https, not http, at the beginning of the URL.
• Verify that you can ping the NMC.
• Verify that you are using a Web browser supported for the NMC.
See “APC Worldwide Customer Support”.
• If the NMC has just restarted and SSL security is being set up, the
NMC may be generating a server certificate. The NMC can take up
to one minute to create this certificate, and the SSL server is not
available during that time.