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B TROUBLESHOOTING
PROBLEMS ACCESSING THE MANAGEMENT INTERFACE
Table 203: Troubleshooting Chart
Symptom Action
Cannot connect using
Telnet, web browser, or
SNMP software
â—†
Be sure the switch is powered on.
â—†
Check network cabling between the management station and
the switch. Make sure the ends are properly connected and
there is no damage to the cable. Test the cable if necessary.
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. Try using another SSH client or check for
updates to your SSH client application.
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—†
Check to see if you have set the terminal emulator program to
VT100 compatible, 8 data bits, 1 stop bit, no parity, and the
baud rate set to 115200 bps.
â—†
Verify that you are using the DB-9 null-modem serial cable
supplied with the switch. If you use any other cable, be sure
that it 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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