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B Troubleshooting
Problems Accessing the Management Interface
Table 44: 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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