环境：
2个小机，aix 6100-06-08-1216，Oracle RAC

lslpp -l |grep -i openssh

openssh.base.client 5.4.0.6100 COMMITTED Open Secure Shell Commands
openssh.base.server 5.4.0.6100 COMMITTED Open Secure Shell Server
openssh.man.en_US 5.4.0.6100 COMMITTED Open Secure Shell
openssh.base.client 5.4.0.6100 COMMITTED Open Secure Shell Commands
openssh.base.server 5.4.0.6100 COMMITTED Open Secure Shell Server

lslpp -l|grep -i openssl

openssl.base 0.9.8.1300 COMMITTED Open Secure Socket Layer
openssl.license 0.9.8.1300 COMMITTED Open Secure Socket License
openssl.man.en_US 0.9.8.1300 COMMITTED Open Secure Socket Layer
openssl.base 0.9.8.1300 COMMITTED Open Secure Socket Layer

前两天节点1的内存故障了，更换以后，发现ssh 连接异常。具体描述如下：

rac_ip

10.1.0.111 wlrac1
10.1.0.112 wlrac2
10.1.0.113 wlrac1-vip
10.1.0.114 wlrac2-vip
192.168.5.111 wlrac1-priv
192.168.5.112 wlrac2-priv
10.1.0.115 wlrac-scan

详情：

两节点私有网络192.168.5.111和两节点私有网络192.168.5.112 之间的ssh 不通
从节点1到节点二 # ssh 192.168.5.111 或者 从节点二到节点1# ssh 192.168.5.111
执行完不动，一直等着

从其他192.168.5.网段的其他机器上都可以连接到这个node 均没有问题，ssh 连接也正常

诊断：
使用ssh -vvv
从节点2 到节点1

ssh -vvv -p 22 192.168.5.111

OpenSSH_5.4p1, OpenSSL 0.9.8m 25 Feb 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: Failed dlopen: /usr/krb5/lib/libkrb5.a(libkrb5.a.so): Could not load module /usr/krb5/lib/libkrb5.a(libkrb5.a.so).
System error: No such file or directory

debug1: Error loading Kerberos, disabling Kerberos auth.
debug2: ssh_connect: needpriv 0
debug1: Connecting to 192.168.5.111 [192.168.5.111] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: identity file /.ssh/id_rsa type -1
debug1: identity file /.ssh/id_rsa-cert type -1
debug1: identity file /.ssh/id_dsa type -1
debug1: identity file /.ssh/id_dsa-cert type -1
debug1: Remote protocol version 2.0, remote software version OpenSSH_5.4
debug1: match: OpenSSH_5.4 pat OpenSSH*
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_5.4
debug2: fd 3 setting O_NONBLOCK
debug1: SSH2_MSG_KEXINIT sent