Microsoft ES4612 User Manual

B-1

Cannot connect using Telnet, 

web browser, or SNMP 

software

• 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 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 

Secure Shell

• 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. 

• 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 

configuration program via a 

serial port connection

• 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 any of the 
following (9600, 19200, 38400, 57600, 115200 bps). 

• 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.