I'm new to Apache and web serving generally, so apologies if this is a very stupid question.

I want to configure a new sub-domain on a working site and install a forum there. I'm using a Debian server that already has Apache, mod_wsgi and a bunch of virtual hosts successfully running on it.

I first installed my forum app (Django's OSQA). Following the OSQA instructions, I then created an Apache config file that specified ServerName as the new sub-domain. I also created a .wsgi file for the app, and pointed WSGIScriptAlias at it. I then restarted Apache.

However, when I go to the new sub-domain, I get a 404 error message. Two questions:

• Is there a step missing above? Or is simply creating a new Apache config file in sites-available enough to 'tell' Apache about a new sub-domain?
• If there's something else going wrong, how can I debug it? The ErrorLog and CustomLog specified in the config file are both blank. apache2.conf, which I guess is Apache-wide configuration, specifies ErrorLog /var/log/apache2/error.log, but this is yet another blank file.