why I can login by telnet using root account
but when i use login by ssh using root account
it is not successful ,is it different password
i am sure ssh service is started
Can you please post the error messages that are presented by ssh? It would also be helpful if you could try the ssh with the -v option and post the output from that:
ssh -v -l root target-host-name
The output will probably have a clue as to what is broken.
Check for PermitRootLogin in your sshd_config.
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