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Analysis on causes of failure of Telnet ( 1 )

Publication Date:  2012-12-18 Views:  733 Downloads:  0
Issue Description
Telnet USG5100, displaying banner information and tips lost with host connection, logon failure.

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Warning: login password has not been set!

Lost to host connection.
Alarm Information
See the description of the phenomenon.
Handling Process
In the vty user view configuration authentication mode
[USG5100] user vty 0 4
[USG5100-ui-vty0-4] authentication AAA
Root Cause
Since the server has returned to the banner information, that is, the port of routing. No username password interface, the device not configured telnet authentication method, in the user vty view not configure telnet authentication method ( equivalent to not open telnet service ). The server rejected the client telnet request.