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PPENDIX
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T
ROUBLESHOOTING
Troubleshooting Chart
Troubleshooting Chart
Symptom Action
Cannot connect
using Telnet, Web
browser, or SNMP
software
• Be sure to have configured the agent with a valid IP
address, subnet mask and default gateway.
• Be sure that your management station has management
VLAN access to the switch (default is VLAN 1).
• Check that you have a valid network connection to the
switch and that the port you are using has not been
disabled.
• Check network cabling between the management station
and the switch.
• If you cannot connect using Telnet, you may have exceeded
the maximum number of concurrent Telnet sessions
permitted. Try connecting again at a later time.
Cannot access
the on-board
configuration
program via a serial
port connection
• Be sure to have set the terminal emulator program to
VT100 compatible, 8 data bits, 1 stop bit, no parity and
9600 bps.
• Check that the null-modem serial cable conforms to the
pin-out connections provided in Appendix B.
Forgot or lost the
password
• Reinstall the switch defaults or runtime code. Make a direct
connection to the switch’s console port and power cycle
the switch. During the POST diagnostics, access the
firmware-download menu and select the appropriate
options. See “Upgrading Firmware via the Serial Port” on
page A-2 for more details.