ssh远程登录验证密钥失败

一个邮件日志脚本，突然有一天发现，无法自动把日志传送到之日服务器，脚本都是一样的。
手动scp也过不去，ssh也无法验证
通过ssh -v进行错误查看

[root@wjyz02 ~]# ssh -v maillog@192.168.1.100
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 192.168.1.100 [192.168.1.100] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /root/.ssh/identity type -1
debug1: identity file /root/.ssh/id_rsa type 1    观察到这行的type和正常验证的不一样，正常的值是-1
debug1: identity file /root/.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-ctr hmac-md5 none
debug1: kex: client->server aes128-ctr 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 '192.168.1.100' is known and matches the RSA host key.
debug1: Found key in /root/.ssh/known_hosts:1
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,password
debug1: Next authentication method: publickey
debug1: Trying private key: /root/.ssh/identity
debug1: Offering public key: /root/.ssh/id_rsa
debug1: Authentications that can continue: publickey,password
debug1: Trying private key: /root/.ssh/id_dsa
debug1: Next authentication method: password
maillog@192.168.1.100：

下面的信息也没有太明显的错误之类的，于是删掉本地的私钥，删掉文件夹，通过ssh-keygen生成.ssh文件夹，把私钥拷过来，还是不可以。
愣住了，这可咋办，查看ssh --help  发现个-i的参数，于是ssh -i /pwd/id_rsa_test name@192.168.1.100 奇迹发生，验证通过了，-i /root/.ssh/id_rsa 还是不可以，看来不是我id_rsa 的问题，是
.ssh这个文件的问题，手动建立了.ssh文件夹，拷贝id_rsa在ssh name@192.168.1.100通过了

debug1: identity file /root/.ssh/id_rsa type -1

这个验证也变成了-1