可以在windows平臺下使用putty連接遠程linux主機。

如果putty提示“Connection refused”，那么可能是遠程主機沒有安裝OpenSSH。可以通過命令

# rpm -qa openssh

# rpm -qa openssh-server

查看是否安裝OpenSSH。如果沒有，需自行安裝。一般系統安裝盤中都有OpenSSH的安裝軟件包。

如果已經安裝了OpenSSH，那么可能的原因就是沒有啟動SSH了。這時候的情況一般如下：

# /usr/sbin/sshd

系統提示“Could not load host key: /etc/ssh/ssh_host_key

Could not load host key: /etc/ssh/ssh_host_rsa_key

Could not load host key: /etc/ssh/ssh_host_dsa_key

Disabling protocol version 1. Could not load host key

Disabling protocol version 2. Could not load host key

sshd: no hostkeys available — exiting”

大致的意思就是需要某個key什么的。

解決辦法如下：

#ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key

Generating public/private dsa key pair.

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /etc/ssh/ssh_host_dsa_key.

Your public key has been saved in /etc/ssh/ssh_host_dsa_key.pub.

The key fingerprint is:

xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx:xx root@localhost.localdomain

#ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key

Generating public/private rkey pair.

Enter passphrase (empty for no passphrase):

Enter same passphrase again:

Your identification has been saved in /etc/ssh/ssh_host_rsa_key.

Your public key has been saved in /etc/ssh/ssh_host_dsa_rey.pub.

root@localhost.localdomain

#/usr/sbin/sshd

這時候，就可以在windows底下使用putty連接這臺linux主機了。