Accton Technology ES3552XA, ES3526XA manual Table B-1 Troubleshooting Chart, Symptom Action

Appendix B: Troubleshooting

Problems Accessing the Management Interface

	Table B-1 Troubleshooting Chart
Symptom	Action
Cannot connect using Telnet,	• Be sure the switch is powered up.
web browser, or SNMP	• Check network cabling between the management station and the switch.
software
	• Check that you have a valid network connection to the switch and that the
	port you are using has not been disabled.
	• 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.
	• Be sure the management station has an IP address in the same subnet as
	the switch’s IP interface to which it is connected.
	• 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.
	• 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	• If you cannot connect using SSH, you may have exceeded the maximum
Secure Shell	number of concurrent Telnet/SSH sessions permitted. Try connecting
	again at a later time.
	• 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.
	• Be sure you have generated a public key on the switch, and exported this
	key 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 public
	key authentication is used).
Cannot access the on-board	• Be sure you have set the terminal emulator program to VT100 compatible,
configuration program via a	8 data bits, 1 stop bit, no parity, and 9600 bps.
serial port connection	• Check that the null-modem serial cable conforms to the pin-out
	connections provided in the Installation Guide.
Forgot or lost the password	• Contact your local distributor.

B-1