bug#47431: Process Whois connection broken by remote peer.

[Eli Zaretskii]

> From: Hongyi Zhao <hongyi.zhao@gmail.com>
> Date: Sat, 27 Mar 2021 09:39:20 +0800
> 
> On Ubuntu 20.04, I'm using the self compiled git master version of Emacs.
> It seems that the whois client in Emacs only works for some specific domain
>  names, for example gnu.org and emacs.org, but for others like
> facebook.com it just hangs and returns nothing. The following command
> will trigger the error:
> 
> "M-x RET whois RET facebook.com"

It doesn't hang here (I'm not on Ubuntu, though).  It times out:

  open-network-stream: make client process failed: Connection timed out, :name, 
Whois, :buffer, *Whois*, :host, rs.internic.net, :service, 43, :nowait, nil, 
:tls-parameters, nil, :coding, nil

If I try a different server, it does work:

  C-u M-x whois RET facebook.com RET whois.crsnic.net RET

This returns immediately with a large *Whois* buffer.

Perhaps some network expert could tell why we use by default a server
that is less useful.