root@debian:/home/fw# telnet 1.1.1.3
Trying 1.1.1.3…
telnetlnet: Unable to connect to remotelnet host: Connection refused
root@debian:/home/fw#
Router Config
# BEFORE
IOU2#sh run | b vty
line vty 0 4
password lvty0
login
transport input none
Problem due to “transport input none”
Solution: Change from none to all
# BEFORE
IOU2#sh run | b vty
line vty 0 4
password lvty0
login
transport input all
# VERIFY
root@debian:/home/fw# telnet 1.1.1.3
Trying 1.1.1.3…
Connectelnetd to 1.1.1.3.
Escape charactelnetr is ‘^]’.
REFERENCE: