My ssh seems only accept public key authentication now. Even if I'm sure that "PasswordAuthentication" is yes in my /etc/ssh/ssh_config. Here is my ssh log. I wanna know why the password authentication is not allowed in my ssh? P.S: I can force ssh to use password authentication by adding "-o PubkeyAuthentication=no" in the command line.
markz@markz-hp6200:~$ ssh -l lab 10.19.170.114 -v
OpenSSH_5.9p1 Debian-5ubuntu1, OpenSSL 1.0.1 14 Mar 2012
debug1: Reading configuration data /home/markz/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 10.19.170.114 [10.19.170.114] port 22.
debug1: Connection established.
debug1: identity file /home/markz/.ssh/id_rsa type -1
debug1: identity file /home/markz/.ssh/id_rsa-cert type -1
debug1: identity file /home/markz/.ssh/id_dsa type -1
debug1: identity file /home/markz/.ssh/id_dsa-cert type -1
debug1: identity file /home/markz/.ssh/id_ecdsa type -1
debug1: identity file /home/markz/.ssh/id_ecdsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.9p1 Debian-5ubuntu1
debug1: match: OpenSSH_5.9p1 Debian-5ubuntu1 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.9p1 Debian-5ubuntu1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr hmac-md5 none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA d5:c0:00:1b:bf:54:56:a0:c6:68:6f:62:a4:1a:e3:e1
debug1: Host '10.19.170.114' is known and matches the ECDSA host key.
debug1: Found key in /home/markz/.ssh/known_hosts:10
debug1: ssh_ecdsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,password
debug1: Next authentication method: publickey
debug1: Offering RSA public key: markz@markz-hp6200
debug1: Authentications that can continue: publickey,password
debug1: Offering RSA public key: markz@markz-hp6200
debug1: Authentications that can continue: publickey,password
debug1: Offering RSA public key: markz@markz-hp6200
debug1: Authentications that can continue: publickey,password
debug1: Offering RSA public key: markz@markz-hp6200
debug1: Authentications that can continue: publickey,password
debug1: Offering RSA public key: markz@markz-desktop
debug1: Authentications that can continue: publickey,password
debug1: Offering RSA public key: markz@markz-desktop
Received disconnect from 10.19.170.114: 2: Too many authentication failures for lab
The SSH client doesn't have a change to even try password authentication because all authentication attempts are used for your public keys.
Removed unused public keys, add something like
Host * PubkeyAuthentication=no
to ~/.ssh/config or actually use public key authentication by adding a public key to ~/.ssh/authorized_keys on the server side.