DNS Lookup problem - Windows 7
I have a very odd problem Sometimes when browsing to a site I get the response that the site isn't found and then a retry fixes it. However sometimes it doesn't but then running ipconfig /flushdns fixes it completely. It is as though the DNS store in Windows 7 is getting corrupted.
November 17th, 2009 3:41pm

This could be a problem not only with Windows7 DNS but with your ISP dns. You could change to different DNS servers and see if that helps the situation Control Panel --> Network and Internet --> Network and Sharing Center --> Change Adapter Settings --> Right click --> Properties --> IP V4 --> Click properties Then select use the following DNS Server addresses and enter new DNS servers such as OpenDNS 208.67.222.222 208.67.220.220
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November 18th, 2009 1:23am

I had a similar problem. I could not access .edu websites. Changing the DNS to the addresses above solved the problem. I had Windows 7 Ultimate beta version and everything was fine. When I installed Windows 7 home version when it was released, the problem started.
November 18th, 2009 7:41am

I assume you make clean installs of Windows 7 RTM. If there are continued problems, check you router if you have one. Check the status and make sure it has your ISP's DNS servers available. It could their DNS is not configured properly. That is also fixable, I use BIND9 on my Linux as a secondary DNS. Vote if answered or helpful, I am running for Office (joke)! IT/Developer, Windows/Linux/Mainframe Server: P4-2GHz, 1.5 GB RAM, Linux Server, need IDE/SATA disks for my chess site Workstation: Asus M2NBP-VM CSM, Athlon64 X2 4200+ 65W CPU, 2GB RAM, NVIDIA 8600GT, 320GB + 160G backup, Windows 7 Ultimate x64.
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November 18th, 2009 8:38am

I also think the issue is caused by your hosts file or the ISP DNS. To fix our issue, you can try to clear the Hosts file using the following steps:1. Click the Start Button, type "%SystemRoot%\system32\drivers\etc" (without quotation marks) and press Enter. 2. Right-click on the file "Hosts" (without quotations) and choose Delete. 3. Click Continue to confirm the deletion and verify the administrator permission. After that, please run the command ipconfig /flushdns to clean up the DNS cache again.Now, what's up?If we still have trouble in browsing websites, its better to set our local DNS to an Open DNS, Such as: 208.67.222.222208.67.220.220 Ihope this can help you! John John
November 18th, 2009 1:16pm

First point - my DNS servers are set up to use OpenDNS as primary and my ISP DNS server as secondary so I doubt if that is the problem. Regarding the hosts file can you explain why this could cause the problem given that the only active line is 127.0.0.1 rad.msn.com to stop the annoying adverts in Messenger which I would want to retain. Is it worth disabling the DNS caching as a check
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November 18th, 2009 8:50pm

Change you DNS to be secondary and you ISP to be primary, that is how you should set it up. If you have it backwards, you will have to have A records for every site you want to visit.Vote if answered or helpful, I am running for Office (joke)! IT/Developer, Windows/Linux/Mainframe Server: P4-2GHz, 1.5 GB RAM, Linux Server, need IDE/SATA disks for my chess site Workstation: Asus M2NBP-VM CSM, Athlon64 X2 4200+ 65W CPU, 2GB RAM, NVIDIA 8600GT, 320GB + 160G backup, Windows 7 Ultimate x64.
November 19th, 2009 3:49am

I did that but no improvement.However in desperation I started using IE8 instead of Firefox 3.5 and that fixed it
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November 21st, 2009 6:24pm

Its possible to use your secondary DNS but its a nuisance to setup. I use the hosts file and that works for me on the intranet. Vote if answered or helpful, I am running for Office (joke)! IT/Developer, Windows/Linux/Mainframe Server: P4-2GHz, 1.5 GB RAM, Linux Server, need IDE/SATA disks for my chess site Workstation: Asus M2NBP-VM CSM, Athlon64 X2 4200+ 65W CPU, 2GB RAM, NVIDIA 8600GT, 320GB + 160G backup, Windows 7 Ultimate x64.
November 21st, 2009 10:25pm

At this point, you can try to get a latest versionf of Firefox to test, since the IE8 works fine now, the issue should be caused by the incorrect setting or corrupted system files in the Firefox.John
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November 23rd, 2009 5:55am

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