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Analysis on causes of failure of Telnet ( 2)

Publication Date:  2012-12-18 Views:  521 Downloads:  0
Issue Description
Telnet logging equipment
Connecting to ...No response,
20 seconds after the prompt " cannot open connection to the host, on port 23: connection failed ".
Alarm Information
See description information.
Handling Process

Check the network reachability and equipment side of Telnet services and related configuration.
Root Cause
This phenomenon is due to the client did not receive equipment back to the response message to login failed, the specific reason is unreachable message routing, or port unreachable ( request message is the intermediate device filter ), or a return message to be filtered, and the path is not the same as may appear to return to message could not be delivered to the client. Return path consistency, while the device side not to open telnet service or authentication failed general won't appear this kind of phenomenon.
Through the different phenomena to distinguish the nature of the problem, reduce the fault reason, facilitates rapid periodic root cause.