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Updated by krishan-vijay on Dec 30, 2020
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9 Ways to Troubleshoot DNS Resolution Issues

We are listing some of the easy and effective ways to tackle DNS Server Issue for your reference. But you have to read till the finish line to figure out the best-suited trick to troubleshoot DNS issues.

2

Check Network Connectivity

Check Network Connectivity

It is the first trick every user will perform to troubleshoot DNS issues. This trick will enable the user to check whether the server still has internet access or not? If this trick works for fixing the DNS server issue, you can save a lot of crucial time.
The best way to check the connectivity is to log in to the DNS Server and try testing a few devices. Moreover, you can try tethering the DNS server from various random computers. You have to keep in mind that this trick will work only if you allow ICMP packets to trigger via a firewall on your computer.

3

Inspect whether DNS Server Performing Load Balancing or not?

Inspect whether DNS Server Performing Load Balancing or not?

Many enterprises face DNS server issues while running the high-demand web server attempting to disperse workload among several equivalent web servers using the DNS Round Robin technique.
DNS Round Robin is a technique for load sharing. But the user may observe a limitation while using this technique to troubleshoot DNS issues. They may feel that the DNS server has no way of communicating when any of the servers failed.

As the server crashes, it will route the inbound traffic to every server involved in the Round Robin mode even when one of these servers is offline. It will result in intermittent connectivity issues to a load-balanced network.

4

Check Whether Your DNS Server IP Address is in Sequence and Accurate.

Check Whether Your DNS Server IP Address is in Sequence and Accurate.

When you have a network connection and a legitimate IP address, try to delve more in-depth into DNS to ensure that the DNS server's IP address is in the correct order and valid.
Then a dialogue box will appear on the screen with the IPv4 DNS Server IP addresses. You should check that most of them are connected to the local network. However, it does not mandate the DNS servers, DNS Server IPs, or ISP's are on the same subnet,

5

Try on Other DNS Server

Try on Other DNS Server

Many of the companies face a DNS server issue; then their alternative servers can solve their problem. Majorly companies have at least two or more DNS servers. If in case the main DNS Server fails then you can use an alternate DNS server.
After switching to another server, if name resolution starts functioning, you will confirm that the problem is directly connected with the DNS server not because of external factors.

6

Evaluate the Scope of DNS Server Issue

Evaluate the Scope of DNS Server Issue

If you observe that there is no connectivity issue and are still getting a message that DNS Address Could Not Be Found, you need to evaluate the magnitude of the issue.
Do both the Local name and local name resolutions fail? The answer to this question will help the user to troubleshoot DNS issues. For example, one of the ISP's DNS servers can solve the problem if one of the local name servers is operational, but internet name resolution is non-operational.

7

Use the NSLookup Technique

Use the NSLookup Technique

NSLookup is one of the handiest tools when DNS Server is not responding. You can use this technique from a Command Prompt Window. You can type NSLookup. And, then enter the name of the host you want to check for testing the name resolution.

Windows will get back with the results like the IP address and name of the DNS server, resolving the name resolution issues. Even you will find that the server name is coming as unknown. You will also get the full details about the IP address and domain name of the host you have mentioned.

8

Examine the Forwarders of DNS Servers

Examine the Forwarders of DNS Servers

Suppose you find that unlike local name resolutions, internet requests are not operational. Then, you need to examine whether DNS servers are using forwarders or not? Many DNS servers use forwarders to connect to ISP's DNS site. At the same time, other DNS servers utilize root hints for internet name resolutions.
Moreover, if the DNS server slows down, then the Internet resolution name will cease to operate as the resolve cache entries expire. If your DNS server uses forwarders, they try to connect with the server to check whether it's online or not.
If your DNS server is not responding, then you need to connect with the ISP and make sure that your IP address used with forwarder is still correct.

9

Scan For Preventing Virus Attack

Scan For Preventing Virus Attack

Many of the users complained about the virus attack on the TCP/ IP stack and hijack all name resolution requests. Initially, it seems to be one of the DNS server issues, but the real culprit is a virus attack.

10

Reboot Your DNS Router

Reboot Your DNS Router

DHCP usually transfers the DNS router settings with the DNS server configured to the router's IP. Also, the router will redirect the DNS to the DNS server of the ISP.
Like your local system has network information, including the DNS server's IP address, your router has some bad information. However, to ensure that your DNS server has all the latest details, you must renew and release DHCP on the WAN interface of the router with the ISP. Or the simple and best way to fix the DNS server issue is to reboot the DNS router.