How to Handle DNS Problem in Windows 10

DNS problem can be root cause on your computer if you have no issue connecting to the network but keep on getting 404 Page Not Found error or page not able to load issue when surfing websites.



Let's quickly talk about what is DNS (Domain Name System) and why do we need it before talking about how to resolve it. In Internet world all networking devices, such as computer, laptop, mobile phone, router and switch talk to each other by using IP address, therefore we actually need to key in IP address in web browser when trying to access any website, but it's difficult to remember those IP addresses and so here comes the use of DNS that ties each IP address with a domain name (google.com, cnn.com, etc.), which is human meaningful name to ease the website or other Internet related accesses. With DNS, we just need to key in the domain name or URL in web browser, then in background DNS server helps to translate it to IP address and route the web traffic to destination server which will send us back the web content.

In order to troubleshoot this DNA problem, first you need to confirm there is DNA server configured on computer. Let's do it in Windows 10 as an example here, but similar approach can be done in other Windows OS.

1) Just open up the command prompt, and type ipconfig /all to ensure there is DNS server configured. In the example below, I use the DNA servers configured on my router 192.168.1.1 for web browsing.
Check DNS servers
2) If there are DNS servers configured, proceed to use nslookup to resolve or translate the domain name to IP address so that you can confirm the DNS works fine as shown here. If it fails to resolve, proceed to reset the DNS or change the DNS servers.
nslookup domain name
3) Go ahead to reset and clear DNS cache by issuing ipconfig /flushdns to find out if it solves the problem. If the problem still persists, you can then change the DNS servers and try again.
flush DNS cache
4) Follow this simple guide to change the DNS servers in Windows 10 and test again. In this case you can try out the free DNS servers from Opendns (208.67. 222.222, 208.67. 220.220) or Google (8.8.8.8, 8.8.4.4) and find out how it goes. Most of the time the DNS problem will be resolved after changing the DNS servers.

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