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I have two Windows 7 machines on my home network that always give 'Unreachable' errors when I try to access any site. The other devices on the same network work fine (iPhone, iPad, Mac, Ubuntu) The problem started when the router was reset but this problem doesn't seem to be caused by the router.

I have already tried changing the authentication settings, used open DNS servers but to no effect. Websites are reachable via IP addresses but not hostnames. Also, most of the times it starts working automatically.

Can anyone tell me what the problem is how to resolve it.


Edit: I guess my question now is - how do I troubleshoot DNS. I can ping the DNS servers but cannot do an nslookup

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It's pretty dumb but check services.msc (or Services console) and see if your DNS resolver/client is running – Ashtray Aug 26 '13 at 6:34
Are you using DHCP configuration on your Win7? – Ashtray Aug 26 '13 at 6:40
Tried with both DNS client started and stopped, same issue. The description says DNS client is just a cache, so it shouldn't matter even if it's not running. Yes, I am using DHCP config, IPv4 is set to get IPs automatically from router, I've just modified the DNS to open DNS IPs – Vortex Aug 26 '13 at 14:55
Is the IPv6 box checked under the NIC properties. If it is, and you aren't using v6 try unchecking and try it again. Also, just out of curiosity, do you get the same results when you run IE with no addons? – JamesTheDev Aug 26 '13 at 18:57
Yes, I have tried disabling IPv6. The browser doesn't matter, I cannot look up any domain using any application including the command line. – Vortex Aug 31 '13 at 3:23

Try this:

  1. open up the command prompt

  2. try the command: ipconfig /flushdns

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