昨天下午远程 ssh 的好好的，突然就死掉了，另外开了一个 screen，尝试先 ssh 到前端的一台机子，没有问题，接着再 ssh 到内网，不是提示 time out 就是 connection refused，前者还能理解，后者就怎么也说不通了，不可能被加到 hosts.deny 里面去，我后端的机子没有做 denyhosts。ping 还是能 ping 的通的，nmap 看看：
Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2011-04-15 17:02 CST
Interesting ports on 192.9.205.30:
Not shown: 1677 closed ports
PORT STATE SERVICE VERSION
135/tcp open msrpc Microsoft Windows RPC
139/tcp open netbios-ssn
445/tcp open microsoft-ds Microsoft Windows XP microsoft-ds
MAC Address: (Unknown)
Device type: general purpose
Running: Microsoft Windows 2003/.NET|NT/2K/XP
OS details: Microsoft Windows 2003 Server or XP SP2
Service Info: OS: Windows
Interesting ports on 192.9.205.30:
Not shown: 1677 closed ports
PORT STATE SERVICE VERSION
135/tcp open msrpc Microsoft Windows RPC
139/tcp open netbios-ssn
445/tcp open microsoft-ds Microsoft Windows XP microsoft-ds
MAC Address: (Unknown)
Device type: general purpose
Running: Microsoft Windows 2003/.NET|NT/2K/XP
OS details: Microsoft Windows 2003 Server or XP SP2
Service Info: OS: Windows
Nmap finished: 1 IP address (1 host up) scanned in 8.533 seconds
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