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B TROUBLESHOOTING
PROBLEMS ACCESSING THE MANAGEMENT INTERFACE
Table 161: Troubleshooting Chart
Symptom Action
Cannot connect using
Telnet, web browser, or
SNMP software
â—†
Be sure the switch is powered up.
â—†
Check network cabling between the management station and
the switch.
â—†
Check that you have a valid network connection to the switch
and that the port you are using has not been disabled.
â—†
Be sure you have configured the VLAN interface through which
the management station is connected with a valid IP address,
subnet mask and default gateway.
â—†
Be sure the management station has an IP address in the
same subnet as the switch’s IP interface to which it is
connected.
â—†
If you are trying to connect to the switch via the IP address
for a tagged VLAN group, your management station, and the
ports connecting intermediate switches in the network, must
be configured with the appropriate tag.
â—†
If you cannot connect using Telnet, you may have exceeded
the maximum number of concurrent Telnet/SSH sessions
permitted. Try connecting again at a later time.
Cannot connect using
Secure Shell
â—†
If you cannot connect using SSH, you may have exceeded the
maximum number of concurrent Telnet/SSH sessions
permitted. Try connecting again at a later time.
â—†
Be sure the control parameters for the SSH server are
properly configured on the switch, and that the SSH client
software is properly configured on the management station.
â—†
Be sure you have generated both an RSA and DSA public key
on the switch, exported this key to the SSH client, and
enabled SSH service.
â—†
Be sure you have set up an account on the switch for each
SSH user, including user name, authentication level, and
password.
â—†
Be sure you have imported the client’s public key to the switch
(if public key authentication is used).
Cannot access the on-
board configuration
program via a serial port
connection
â—†
Be sure you have set the terminal emulator program to VT100
compatible, 8 data bits, 1 stop bit, no parity, and the baud
rate set to any of the following (9600, 19200, 38400, 57600,
115200 bps).
â—†
Check that the null-modem serial cable conforms to the pin-
out connections provided in the Installation Guide.
Forgot or lost the
password
â—†
Contact your local distributor.
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