I've been having a problem for the last couple of weeks with the Drupal website I've been working on where the webserver couldn't resolve any external URLs, which meant that the website couldn't check for updates, send e-mails, or access anything on the internet because it couldn't resolve web addresses through DNS.
(Geek mode on, work mode off...)
Ohhhhh dear... ;o)
p.s. Happy Valentine's day y'alls