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

[Eli Zaretskii <eliz@gnu.org>]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: Eli Zaretskii <eliz@gnu.org>,  47431@debbugs.gnu.org
> Date: Sun, 28 Mar 2021 16:11:14 +0200
> 
> Hongyi Zhao <hongyi.zhao@gmail.com> writes:
> 
> > open-network-stream: Failed connect: No route to host
> 
> I can reproduce this in Emacs 28...  but only intermittently.  Sometimes
> it will hang completely, and sometimes I get the timeout.
> 
> This is the backtrace (with debug-on-quit) when it just hangs:
> 
> Debugger entered--Lisp error: (quit)
>   make-network-process(:name "Whois" :buffer #<buffer *Whois*> :host "rs.internic.net" :service 43 :nowait nil :tls-parameters nil :coding nil)
>   open-network-stream("Whois" #<buffer *Whois*> "rs.internic.net" 43)
>   run-network-program("Whois" "rs.internic.net" 43 "facebook.com")
>   whois(nil "facebook.com")

I think we should simply update the list of servers we use, it sounds
like what we have is outdated.  The default should be useful and
easily reachable.  But I'm not an expert on this stuff.