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Problem Management
Problem management includes isolating and quantifying problems, and applying solutions.
When a problem is detected, the exact nature of the problem must be determined. Problem analysis includes how
the problem is detected, and what are its possible causes. With the problem known, the effects of the problem are
recorded, including all known results of the problem. Once the problem is quantified, the appropriate solution can
be applied. Solutions to common troubleshooting issues are found either in this document, or can be obtained
through Customer Support.
If no solution is found in this document, please contact Customer Support for advice and instructions.
Troubleshooting Solutions
Listed below are possible troubleshooting problems and their solutions. These error messages include:
•
Cannot connect to management using RS-232 serial connection
•
Cannot connect to switch management using Telnet, HTTP, SNMP, etc.
•
Self-test exceeds 15 seconds.
•
No connection is established and the port LED is on.
•
Device is in a reboot loop
•
No connection and the port LED is off
•
Add and Edit pages do not open.
•
Lost password
P r o bl em
Cannot connect to
management using RS-
232 serial connection
Cannot connect to
switch management
using Telnet, HTTP,
SNMP, etc.
No response from the
terminal emulation
software
Pos si bl e C au se
Faulty serial cable
Incorrect serial cable
Software settings
Page 572
Appendix A Troubleshooting
So lu t io n
Ensure the terminal emulator program is set to
VT-100 compatible, 9600 baud rate, no parity, 8 data bits
and one stop bit.
Use the included cable, or ensure that the pin-out
complies with a standard null-modem cable.
Ensure that the switch has a valid IP address, subnet
mask and a configured default gateway.
Check that your cable is properly connected with a valid
link light, and that the port has not been disabled.
Ensure that your management station is plugged into the
appropriate VLAN to manage the device.
If you cannot connect using Telnet or the web, the
maximum number of connections may already be open.
Please try again at a later time.
Replace the serial cable.
Replace the serial cable for a pin-to-pin straight/flat
cable.
Reconfigure the emulation software connection settings.
Problem Management
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