Re: gnuplot.info unreachable (DNS failure)

[Ethan A M. <me...@uw...>]

On Tuesday, 9 September 2025 14:22:58 PDT Hans-Bernhard Bröker wrote:


> Ethan can't link to gnuplot.info (note: no leading www.).

Good point.  I typed the address into the browser directly because Phillipp's 
reported error message was 
   "Firefox does not trust this site because it uses a certificate that is not
     valid for gnuplot.info"
 
> [...] also fails, with a
> "DNS resolution error 1001"  reported by Cloudflare. 
> Which is strange, as tracert did get an IP,  i.e. DNS actually works.

Yes.  That's the one I'm seeing.  It's an internal error message from Cloudflare
that I get when I request either http://gnuplot.info or https://gnuplot.info

It does work if I request http://www.gnuplot.info   (Chrome or Firefox browsers).

The hyperlink references in the pdf version of the user manual  use the
www.gnuplot.info form.    But the html versions of the manual use
the gnuplot.info form [no www] everywhere.

That much I can fix.
I will modify the gnuplot.doc inline html tables and the code in
doc2web.c to always generate output with the www prefix in the URL. 

However it is probably a common "mistake" for users to omit the www prefix in web
queries since that is no longer as near-universal as it once was.  For that matter
Chrome actively hides the "www." prefix when it shows the current site in the bar
at the top, so a cut-and-paste may fail to capture the full, working, address.

   Ethan