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I have two servers. Say A and B.

I ssh-copy-ided on both servers to each other.

And I can connect from A to B without password. But I failed to connect from B to A.

I found that audit log is different

B's log when connecting from A to B (success)
    ... (hostname=192.168.0.1, addr=192.168.0.1, terminal=sshd ref=success

A's log when connecting from B to A (failed)
    ... (hostname=?, addr=192.168.0.1, terminal=sshd ref=failed

Where should I look into?

Here comes what ssh -v showed.

$ ssh -v user@<a's ip address>
OpenSSH_4.3p2, OpenSSL 0.9.8e-fips-rhel5 01 Jul 2008
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Applying options for *
debug1: Connecting to <a_ip_address> [a_ip_address] port 22.
debug1: Connection established.
debug1: identity file /home/user/.ssh/identity type -1
debug1: identity file /home/user/.ssh/id_rsa type 1
debug1: identity file /home/user/.ssh/id_dsa type -1
debug1: loaded 3 keys
debug1: Remote protocol version 2.0, remote software version OpenSSH_4.3
debug1: match: OpenSSH_4.3 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_4.3
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-cbc hmac-md5 none
debug1: kex: client->server aes128-cbc hmac-md5 none
debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP
debug1: SSH2_MSG_KEX_DH_GEX_INIT sent
debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY
debug1: Host '<a_ip_address>' is known and matches the RSA host key.
debug1: Found key in /home/<user>/.ssh/known_hosts:8
debug1: ssh_rsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,gssapi-with-mic,password
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure.  Minor code may provide more information
Unknown code krb5 195

debug1: Unspecified GSS failure.  Minor code may provide more information
Unknown code krb5 195

debug1: Unspecified GSS failure.  Minor code may provide more information
Unknown code krb5 195

debug1: Next authentication method: publickey
debug1: Trying private key: /home/<user>/.ssh/identity
debug1: Offering public key: /home/<user>/.ssh/id_rsa
debug1: Authentications that can continue: publickey,gssapi-with-mic,password
debug1: Trying private key: /home/<user>/.ssh/id_dsa
debug1: Next authentication method: password
user@<a_ip_address>'s password:
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    From B, run ssh -v A. The option -v means verbose. Copy that result to the text of your question so that we can see where it is failing.
    – John1024
    Jan 19, 2015 at 7:19
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    From B, try: ssh -o GSSAPIAuthentication=no A. This suggestion comes from here. If that doesn't work, have a look at some of the suggestions here.
    – John1024
    Jan 19, 2015 at 7:32
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    Some people who had similar error messages noted a bug with ssh-copy-id and permissions. See: serverfault.com/questions/464411/…
    – John1024
    Jan 19, 2015 at 7:37
  • 1
    Remove the edit and add it as an answer. That way, other users will be able to find it and upvote it. Jan 19, 2015 at 9:09
  • 1
    @JinKwon I just did that for you. And, yes, there is a simple way to select a previous edit: it is the rollback button.
    – John1024
    Jan 19, 2015 at 20:43

1 Answer 1

2

The root cause of my problem is that the home directory, the .ssh directory, and its child files on the target sever have a wrong permissions.

I discovered this issue by looking at messages in log files in /var/log such as secure, and audit/*.

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