Not able to resolve some web site domain names

60 pts.
Tags:
DNS
DNS management
Hi, DNS is not resolving for some reason. We are not able to resolve some domains on the internet. It is very irregular. Mostly any site can be resolved. For example, sun.com will return 'page cannot be displayed', but go to a site never entered before, like cbsnews.com and the site pops up no problem. The inaccessible sites get put into a search engine and return a list of sites from googe or live search. Clicking the site then gives the 'page cannot be displayed' error. I can enter the IP of the site and the site is found. We do not filter any sites or URLs. There is no web proxy server. We have an internet facing Win2003 DNS server pointing to our ISP (A&TT). We have 2 DNS servers on our LAN. Both have forwarding to our internet DNA server and AT&T's DNS servers. NSLOOKUP can resolve some domains in question, but not others. Any ideas would be helpful. Vince
ASKED: April 3, 2008  7:40 PM
UPDATED: April 7, 2008  1:55 PM

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Try ipconfig /flushdns and see if the problem still exists. When you do NSLOOKUP, do you change to ATT DNS servers? Maybe theirs have changed and you need to refresh the addresses. I had that recently happen with my ISP.

You can see what the names should resolve to using a site like <a href=”http://www.network-tools.com”>this</a>.

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On the DNS server, run nslookup to see if it resolves. Verify the server DNS server is using to resolve. Also check the server settings for the local DNS servers. If you suspect a problem, also clear the cache on the local DNS and then try again. Have you looked at the DNS event logs?
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  • Vdinenna
    [...] able to resolve some web site domain names Yahoo! News Search Results for domain names wrote an interesting post today onHere’s a quick excerptNew Question Created. by [...]
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  • Vdinenna
    Thanks for your replies. Ipconfig /flushdns didn't work. Also, clearing the browser cache didn't work. I ran nslookup from the AT&T dns server and it said "no A record", but it says the same thing about sites I can view. We have a Cisco firewall. I might sit on it and see what happens with DNS queries thru it. Any other ideas, I'd like to hear them. Thanks, Vince
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