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thanks for your reply! I am having problem with understanding both solutions you proposed. For the first one, suppose I am now on linux machine M and want to log on server B without inputing password every time, I copied the line ~/.ssh/id_rsa.pub on machine M (which has only one line ) and appended at the end of the file ~/.ssh/authorized_keys on server B. But still I am asked to input password when login using: ssh [email protected]. This file of ~/.ssh/id_rsa.pub on machine M is generated when I set up the automatic (password-free) ssh login to the server A on machine M.

wiswit
– wiswit

2015-12-07 09:23:07 +00:00
Commented Dec 7, 2015 at 9:23
For the alternative solution you suggested, I tried: ssh -i .ssh/id_rsa [email protected] from the machine M, I can use the password to log in successfully. However, when I do "ssh [email protected]", the prompt for password still jumps out.

wiswit
– wiswit

2015-12-07 09:29:37 +00:00
Commented Dec 7, 2015 at 9:29
@wiswit - you should take a look at the logs on serverB - typically if it's not allowing login with keys it might be disabled, or (more likey) there might be permission issues with your authorized_keys file that prevents it from being used.

chander
– chander

2015-12-07 14:51:09 +00:00
Commented Dec 7, 2015 at 14:51

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