Summary of 10 ways to fix DNS Resolution errors on computers

Many times you go to different websites and there are websites that are not accessible, there are websites that work normally. Or lose the network, it is an error that occurs when DNS Resolution is not working, DNS is not the best feature in your network, but it is the most important feature that determines your Internet connection.

If you've ever heard of users accessing the network unstable or collapsed, in the Network Admin role you will often see the cause is usually a DNS server, possibly with DNS Server not responding errors, no DNS server address found ...

To overcome this situation of DNS Resolution, Download.com.vn has made a few tips below to help you fix DNS Resolution error not working on your computer.

1. Check network connection

As mentioned above, in case you open up a web browser like Chrome or Firefox and enter a URL to access, but that URL can not access the website. In this case, many people will think that it is because of network loss, but if you access another URL and still get to it, it is likely that it is your DNS error.

In many cases when you open a Web browser and enter a URL into it, the URL fails to access the Web site. In this case, the first reason you think of is due to DNS errors. However, in this case, the cause may be due to your network connection.

And this will be even more true if you use Wifi to connect to the network, with wireless security protocols, the radio signal will be weakened, leading to lost network connection. The cause of network connectivity can occur on any type of network

In a nutshell, before you check your DNS, start checking "OSI Layer 1 - Physical" first then check your network connection.

Note that in the Network and Sharing Center you will see that the Access type is Local and Internet . If it is Local, it means that your network address is not valid, in this case you only have an APIPA with the address 169.xxx

Then you need to make sure you have a valid IP address on your network, you can check your IP address by right-clicking Ethernet and selecting Properties .

Next you can select Details , check the IP address and confirm the IP address of the DNS Server. If your IP address is 169.xxx, you cannot connect to the Internet.

2. Check the IP address of the standard DNS Server in order or not

After you have a valid IP address and can connect to the Internet, now you intervene deeply in problems in DNS by confirming the DNS Server IP address is correct and in the correct order. You can see the IP address of the IPv4 DNS Server in the third image above, the IP address of the IPv4 DNS Server IP includes the Local LAN / Subnet so that you can access it, even if the default add is broken.

This is how DNS works on most enterprise networks, though, your DNS servers are not usually located on the Subnet. In fact, for most ISPs, the DNS Server IPs are not even on the same subnet as the default gateway.

In most home or small and medium business router configurations (home / SMB) do not have their own DNS servers and SMB routers will delegate DNS to the real DNS servers. In that case, the DNS Server IP address may be the same as your Router IP address.

Finally, you must ensure that your DNS Server address is in the correct order, as shown in Figure 3 above, the internal DNS Server is 8.8.8.8, which is configured to transfer all domains that it cannot assign. address 8.8.4.4, local router address. That router will transfer DNS to the ISP's DNS Server. You can look up those DNS Servers on your router.

First, you must ensure that your DNS Server is in the correct order. If you have a local DNS Server like the one above and are looking up an internal domain name, you want the PC Client to look up that local domain name in the first local DNS Server, before the Internet DNS Server. At that time, your local DNS Server must be first in the DNS settings.

Secondly, you can check the DNS Server IP address by ISP by typing ping, you can also ping them from your local computer.

You should note the response time when pinging the ISP's DNS Server. This process can slow down DNS lookups or can even be deleted if it takes too long for DNS Server to respond.

3. Ping the IP address of the host you know

This is also a quick way to check if the error is caused by DNS, not the network connection, which is ping the IP address of the Host that you want to access. If the connection to the domain name fails but the connection to the IP address is successful, then the error is due to your DNS.

However, if your DNS does not work, it is very difficult to determine the IP address you are connecting to. To perform this test, you must have a diagram, or the network, as many admins do, just remember the host's IP address.

If it works, you just need to wait until the DNS Server is available again, you can put an entry in your host file to Map IP to Hostname.

4. Find the DNS Server you are using with nslookup

Another way you can check your DNS Resolution information is to use the nslookup command, you can use this command to see which DNS Server is giving you the answer and which DNS Server.

As you can see in the figure, the ISP's DNS Server has provided you with "non - authoritative answer" information, which means it does not configure the domain but is still able to respond. You can also use this command to compare responses from different DNS Servers by specifying which DNS Server addresses are used.

5. Check the DNS Server suffix

If you are looking up an internal host on a DNS Server that your computer is on, then you can connect to a host, without using a fully qualified domain name (Fully Qualified DNS) name) and hope that the DNS suffix can help you find the problem.

For example, if we connect to Server1, the DNS Server may have multiple entries for that domain, then your Network Adapter (network adapter) will be configured with the connected DNS suffix.

As shown in the picture, we can see that DNS is wiredbraincoffee.com . Therefore anytime you enter a domain name like Server1, the DNS suffix will be added to its end to form Server1 wiredbraincoffee.com.

6. Make sure the DNS settings are configured to pull the DNS IP from the DHCP server

Just like when you want your Network Adapter to obtain multiple DNS Server IP addresses from the DHCP Server, you can see in the figure that this adapter has obtained DNS Server IP addresses.

You must change to auto with "Obtain DNS server address automatically" in order to get the new DNS Server IP, right-click on your Network Adapter, select Properties > continue Properties , select Internet Protocol Version 4 (TCP / IPv4).

7. Refresh and release all IP addresses of DHCP Server and all DNS information

Although your adapter has been set up to pull DNS information from DHCP, in some cases it may cause IP address conflicts or receive old DNS Server credentials. Therefore, after choosing to "automatically" obtain IP and DNS addresses, release your IP address and renew it.

Now the Command Prompt window is the fastest way to do this, if you have UAC enabled, run cmd as Admin with the command line.

IPCONFIG / RELEASE

IPCONFIG / RENEW

Finally, the IPCONFIG / ALL command shows how the new IP and DNS information is displayed.

8. Check the DNS Server and Restart services or reboot if necessary

Obviously, if the DNS Server is suspended or corrupted, or the configuration is wrong, you will not be able to fix that on the Client Side. However, you can exit the server with the error, the word cannot fix the error.

That way, the person responsible for DNS Server - Admin will have to check the status and configuration of the DNS Server and fix DNS problems.

9. Restart Router if at home or in small office

As mentioned above in the second way and shown in the figure below, on home routers and small offices, DNS Server setup will usually be done via DHCP with the DNS Server set up. a router's IP address and the router will authorize DNS to the ISP's DNS Server.

However, your local computer may have network information (including DNS Server addresses), but it is also possible that your router has incorrect information, to make sure your router has Latest DNS Server information, you can either refresh the WAN interface of the router with the ISP or release a DHCP, or simply restart your home router's device to receive the information. Latest.

10. Contact the Internet Service Provider

Everyone knows how tiring and complex it is to contact an ISP to fix a network problem, but when our computers still have DNS Resolution issues from DNS servers. of the ISP, you need to contact the ISP and that is the last solution.

Above are ways for you to troubleshoot DNS Resolution , help you check DNS errors or computer network errors when using the Internet. In addition, you can fix one of DNS errors that is DNS_PROBE_FINISHED_NXDOMAIN error through the article How to fix DNS_PROBE_FINISHED_NXDOMAIN on Google Chrome .

Hope the article will help you.