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34 Troubleshooting
The Port Status LED is on, but network performance is poor
There may be a full-duplex / half-duplex mismatch between the switch
and a connected device.
Ensure that the connected device has either:
■ Auto-negotiation enabled, or
■ The ports are configured for half-duplex operation
Browser cannot find the Unified Switch 24
Make sure that:
■ The PC’s IP address is in the same IP subnet as the switch.
■ The PC’s subnet mask matches the subnet mask of the switch.
Trouble discovering the access points
Make sure that:
■ The switch’s IP address is in the same IP subnet as the DHCP server.
■ The switch’s subnet mask matches the subnet mask of the DHCP
server.
LTK Error message when activating an AP
An LTK error is caused by either of the following situations:
■ You are trying to activate an AP is already activated on another unified
switch.
■ You are trying to activate an AP that was previously activated on
another unified switch.
When an AP is activated on a unified switch, the AP is imprinted with a
special security key (LTK) that is shared between the unified switch and
the AP. An AP that has been activated by a unified switch will only
communicate with that one switch. If you later wish to activate the AP on
a different unified switch, you must clear the LTK by performing a Short
Reset on the AP as described in
“Resetting Access Points” on page 26.
If the Problem Persists
If the problem persists refer to the more detailed troubleshooting
information in your User’s Guide or on the 3Com Web site.