Troubleshooting The Ethernet Controller; Network Connection Problems - IBM 8670M1X User Manual

A general procedure for troubleshooting power problems is as follows:
1. Turn off the server, and disconnect all ac power cords.
2. Check for loose cables in the power subsystem. Also check for short circuits, for
3. Remove adapters, and disconnect the cables and power connectors to all
4. Reconnect all ac power cords, and turn on the server. If the server starts up
To use this method, it is important to know the minimum configuration required for a
system to start (see page 101). For specific problems, see "Power-supply LED
errors" on page 101.

Troubleshooting the Ethernet controller

This section provides troubleshooting information for problems that might occur with
the 10/100/1000 Mbps Ethernet controller.

Network connection problems

If the Ethernet controller cannot connect to the network, check the following
conditions:
v Make sure that the cable is installed correctly.
v Determine whether the hub supports auto-negotiation. If it does not, try
v Check the Ethernet controller LEDs (on the operator information panel, on the
v Make sure that you are using the correct device drivers, which come with your
v Check for operating-system-specific causes for the problem.
v Make sure that the device drivers on the client and server are using the same
v Test the Ethernet controller.
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xSeries 345 Type 8670: Hardware Maintenance Manual and Troubleshooting Guide
example, if there is a loose screw causing a short circuit on a circuit board.
internal and external devices until the server is at the minimum configuration
required to start the server (see "Minimum operating requirements" on page
112).
successfully, replace adapters and devices one at a time until the problem is
isolated. If the server does not start up from the minimal configuration, replace
FRUs of minimal configuration one at a time until the problem is isolated.
The network cable must be securely attached at all connections. If the cable is
attached but the problem remains, try a different cable.
If you set the Ethernet controller to operate at either 100 Mbps or 1000 Mbps,
you must use Category 5 or higher cabling.
configuring the integrated Ethernet controller manually to match the speed and
duplex mode of the hub.
rear of the server, or both, depending on model; see "Server controls and
indicators" on page 4).
These LEDs indicate whether a problem exists with the connector, cable, or hub.
– The Ethernet transmit/receive activity LED is lit when the Ethernet controller
sends or receives data over the Ethernet network. If the Ethernet
transmit/receive activity LED is off, make sure that the hub and network are
operating and that the correct device drivers are installed.
– The Ethernet link status LED is lit when the Ethernet controller receives a
LINK pulse from the hub. If the LED is off, there might be a defective
connector or cable or a problem with the hub.
server.
protocol.
The way the Ethernet controller is tested depends on which operating system
you are using (see the Ethernet controller device driver README files).