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Old 05-27-2011, 04:57 AM   #1
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How to disable SSH key authentication in linux

Hi All,
We have installed the Centos on server. I have enabled the ssh key authentication in that server. Now we can connect through ssh only with key file.

Since this server is protected with SSH, I am unable to use the SCP command. If I use this command it says "Permission denied (publickey,keyboard-interactive).".

Please let me know How Can I disable SSH Key or why SCP command is not working ?

Old 05-27-2011, 05:46 AM   #2
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The SCP command should work just fine with key based authentication. In fact if you can ssh from a particular machine and user account you should be able to SCP. My initial guess would be that you are trying to SCP as a different user, e.g. root, than you are using for SSH as each user stores the key in their /home/.ssh/ folder. In you sshd_config file you can enable both password and key authentication, by turning password_authentication to yes and restarting ssh. This would negate most of the advantages of using key based authentication, however.

You can try to use the SCP and SSH with the -v flag which will give you verbose output and should show you where things are going wrong.
Old 05-27-2011, 07:06 AM   #3
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My Question is I have installed the ssh key authentication in Server A. User can connect this using key file via SSH. without authentication user can't connect this system via SSH. Now I am trying to copy the file from Server B through SCP command. But it is not working. While I am trying use this command from Server B I am getting below error "ssh: connect to host port 22: Connection timed out lost connection". is Server A. SSH is enabled in both server A,B.

Please let me know why SCP command is not working?

Old 05-27-2011, 09:24 AM   #4
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Moved to Server, as this isn't a security question.
Old 05-28-2011, 02:46 AM   #5
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Can you paste the output of the scp command when using in addition the options -vvv (yes, three times) please.


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