B-1Appendix B: TroubleshootingProblems Accessing the Management InterfaceTable B-1 Troubleshooting ChartSymptom ActionCannot connect using Telnet,web browser, or SNMPsoftware• Be sure the switch is powered up.• Check network cabling between the management station and the switch.• Check that you have a valid network connection to the switch and that theport you are using has not been disabled.• Be sure you have configured the VLAN interface through which themanagement station is connected with a valid IP address, subnet maskand default gateway.• Be sure the management station has an IP address in the same subnet asthe switch’s IP interface to which it is connected.• If you are trying to connect to the switch via the IP address for a taggedVLAN group, your management station, and the ports connectingintermediate switches in the network, must be configured with theappropriate tag.• If you cannot connect using Telnet, you may have exceeded the maximumnumber of concurrent Telnet/SSH sessions permitted. Try connectingagain at a later time.Cannot connect usingSecure Shell• If you cannot connect using SSH, you may have exceeded the maximumnumber of concurrent Telnet/SSH sessions permitted. Try connectingagain at a later time.• Be sure the control parameters for the SSH server are properly configuredon the switch, and that the SSH client software is properly configured onthe management station.• Be sure you have generated a public key on the switch, and exported thiskey to the SSH client.• 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 publickey authentication is used).Cannot access the on-boardconfiguration program via aserial port connection• Be sure you have set the terminal emulator program to VT100 compatible,8 data bits, 1 stop bit, no parity, and 9600 bps.• Check that the null-modem serial cable conforms to the pin-outconnections provided in the Installation Guide.Forgot or lost the password • Contact your local distributor.
