wlampkin on "Removing "www." from site URL"

How can I remove the required "www." from the URL of my WordPress site, so that rather than http://www.thepulp.net, the url can be simply http://thepulp.net?

Currently if you leave off the www. from any URL on the site, you end up on the home page rather than the requested page.

I tried removing www. from the wp-config file, but while the longer URL works, if I try to visit the site without typing in the www. I get "Error establishing a database connection."

I must be missing something. Thanks for any help!