[support] URL of website doesn't point anymore to Drupal installation

[M. Fioretti]

sorry for the vague subject, but I couldn't find a better one.

I have the website http://digifreedom.net running on a VPS with Drupal
6.10 . This is a multisite Drupal setup: only one installation, with
subdirectories in sites/, and a separate mysql database for each
website. For several reasons, I had setup DNS, drupal and everything
to work without the www prefix on domain names. In other words,
http://digifreedom.net is OK, www.digifreedom.net was never used.

Everything worked perfectly for months, if not years. Five minutes
ago, somebody wrote to me that a digifreedom.net URL I suggested him
to read "doesn't work".

I checked, and what happens now is that, if I type
http://digifreedom.net/node/82 the browser is immediately redirected
to www.digifreedom.net/node/82, which returns an error message:

"Firefox can't find the server at www.digifreedom.net"

That error message is OK, because I had NOT set up apache to answer to
that address. What I don't get is why http://digifreedom.net becomes
www.digifreedom.net. I haven't changed anything myself in DNS, drupal
or apache config, so why all of a sudden something started to behave
differently?

The weirdest thing is that this "forced redirection from example.com
to www.example.com happens with some, but not all of the other domains
configured in the same way and running on the same server off the same
Apache/Drupal installation!

How can I find, at least, which piece of the puzzle is responsible for
this problem? I am aware that probably this isn't even a drupal issue,
I just need a pointer in the right direction.

TIA,
	Marco

-- 
Your own civil rights and the quality of your life heavily depend on how
software is used *around* you:            http://digifreedom.net/node/84