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B TROUBLESHOOTING
PROBLEMS ACCESSING THE MANAGEMENT INTERFACE
Table 144: 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.
◆ 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 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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