用 telnet 简测你的服务器(Server)有无在跑

用 telnet 简测你的服务器(Server)有无在跑

有时你可以用 telnet 测试你的 Server 有无正常的 run
例如:我要查看 ftpd 有无在跑
可下指令:# telnet localhost 21
若跑出类似以下的讯息, 表示有在跑
--------------------------------
Trying 127.0.0.1...
Connected to localhost.ahkun.
Escape character is '^]'.
220-=(<*> )=-.:. (( Welcome to PureFTPd 1.0.11 )) .:.-=(<*> )=-
220-You are user number 1 of 50 allowed
220-Local time is now 18:52 and the load is 0.06. Server port: 21.
220 You will be disconnected after 15 minutes of inactivity.

若跑出以下的讯息, 表示没在跑
------------------------------------------------
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
telnet: Unable to connect to remote host

同理你也可以用:
telnet localhost 25 测 stmpd
telnet localhost 110 测 pop3d

结论:
正确来讲是用 telnet 测 port 啦～