DNS problem?

Hi all. From within our internal LAN we can get to our corporate web site by IP address only, not by domain name. If I type into my browser the domain name I'm taken to a seach page that shows a link to the web site, and when I click that link I get an HTTP 400 "Bad request" web page. However, on our Intranet page there's a link to the Internet page and when I click that it does go to the corporate web site, but by IP address and not domain name. In the URL it actually shows the IP address, not the domain name. Any ideas on how to fix this?

See the link below for info on this issue:

http://discussions.virtualdr.com/sho...&highlight=DNS