From: Brian Candler <b.candler@...>
Date: 2011-02-04T03:47:13+09:00
Subject: Re: Net::Telnet question

Nick H. wrote in post #979220:
> I am trying to use Net::Telnet to telnet to a website  to check network
> connectivity...

That's the wrong tool for the job. If you just want to test that the 
remote end accepts a TCP connection, use a socket:

  require 'socket'
  TCPSocket.open("abc.xyz.com", 443)

And this is all nicely wrapped up for you, complete with configurable 
timeout, in ping.rb in the standard ruby library (this may be somewhere 
like /usr/lib/ruby/1.8/ping.rb on your system)

Read the file itself for examples how to use it.

> On linux prompt i get the following output:
>
> $ telnet to abc.xyz.com 443
> Trying xxx.xxx.xxx.xxx...
> Connected to abc.xyz.com.
> Escape character is '^]'.
> hello world
> Connection closed by foreign host.

That's because (1) you are typing something which is not valid HTTP, and 
so the server disconnects immediately, and (2) you are connecting to a 
HTTPS server (port 443), so it needs to talk SSL.

A valid test would be:

openssl s_client -connect abc.xyz.com:443
GET / HTTP/1.0
Host: abc.xyz.com
<hit enter>

But if you just want to check if the host is there, not whether SSL or 
HTTP are working, then ping.rb is what you want.

Regards,

Brian.

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