Can't view a website. DNS Problem?

I helped a friend set up a website, but for some reason, I cannot view the site from my computer.  The strange part, though, is that I have three computers in the same room all running on the same network, and ONE of them WILL load the site, but the other two will not.

Computer #1: Windows XP; will NOT load the site.
Computer #2: Windows 2000 Pro; WILL load the site.
Computer #3: Windows 2000 Pro; will NOT load the site; DSL/CISCO modem connected to this computer, networked with other two using a LINKSYS router.

I've tried the usual power down cycle, restarting computers, etc.  Additionally, I am able to login to the site's control panel, but not via http://domainname.com/cpanel, only via http://ipaddress/cpanel.  This leads me to believe it is a DNS error, which I know nothing about.

Thank you for the help!
Heather :)

heathercapriAsked:
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sirbountyConnect With a Mentor Commented:
Hi Heather - click Start->Run->CMD on all three machines
Type
 IPCONFIG /ALL

Review the settings for DNS addresses and make sure they match.
If not, you will need to reconfigure - do you know if the Linksys is set to provide DNS addresses?

Also - you can check the presence of a HOSTS file on each machine
Start->Run->%systemroot%\system32\drivers\etc
Right click Hosts and click open with...Notepad

You can also manually add the entry to this file, in the format of:

111.22.33.44    domainname.com

Save the file and reboot...
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NeverEnuf81Commented:
Maybe the one computer that will load the web page is set as the demilitarized host in the router..have you checked that?
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heathercapriAuthor Commented:
sirbounty -

Mapping the IP address to the host name in the HOSTS file worked like a charm!  It still seemed like a cheap fix, though, so I changed the HOSTS file back to how it was and checked each of the IP configs to see what was going on.

We are using Qwest DSL, but since I am a student at CU-Boulder, I have my computer routed directly to their server (?? or at least IP address ?? I'm not really sure how this works ??).  Anyway, my computer listed the Connection-specific DNS Suffix as colorado.edu along with CU's IP address, whereas the computer that worked listed qwest.net and Qwest's IP address.

I quickly changed my computer's DNS settings to match the qwest.net settings, and sure enough, the website loaded!  Then, just for kicks, I changed it BACK to CU's DNS settings, expecting the site not to load as before, but it still loaded!  I don't understand this at all!

But regardless, I am happy with all of your suggested solutions and am awarding you with the points for this post.  Thanks so much for all your help!

heather :)
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sirbountyCommented:
Thanx heather - always happy to help!
:D
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heathercapriAuthor Commented:
Whoops! Just kidding!

I was being overly optimistic and didn't take into consideration that the site was stored in my computer's cache from when I had the qwest.net DNS settings active!  Duh! So the site really didn't load when I changed the DNS settings back to CU's IP.

I decided to leave my preferred DNS server as CU's IP, but then I switched my alternate DNS server to Qwest's IP, and now everything works great!

Thanks again!
heather :)
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sirbountyCommented:
ipconfig /flushdns
would've cleared that up (fyi)...
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heathercapriAuthor Commented:
Good to know!  Thank you.
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