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What is DNS Failure? – Resolving the Problem

What is DNS Failure? – Resolving the Problem
When a DNS server is unable to translate a domain name into an IP address in a TCP/IP network, then DNS failure may occur. This occasionally happens within the Internet of in a private network of a company. DNS is a critical service on every network. When something goes erroneous happens to the DNS, the company may get huge problems. A DNS service failure disrupts a company’s operation.

DNS stands for Domain Name System. In simple terms, DNS failure is a type of error that happens in the event that a DNS server is unable to find the domain name a browser is trying to find. There are several causes why DNS failure happens and several things must be considered to resolve such problem.

DNS failures are widely related to various problems. It is essential to determine the symptoms of the problem to come up with a quick solution. The first thing to do is to think of how to narrow the problem. If you are in a network, it is vital to determine if all computer units in the network are experiencing DNS failure. If this is not the case, then check whether the problem exists in a particular network segment. It is necessarily important to take into account that domain names can be cached.

It is also vital to verify if the computers have problem resolving external or internal names, or it can be both. These examinations will bring you to a good foundation in resolving DNS failure. If you find out that all computers in a common segment experiences DNS failure, then it is important to check if that particular segment uses a dedicated DNS server. Or better yet, try to find out if each computer uses the same DNS server.

If the case is the same DNS server is used by workstations in a segment and on the other network segments, then the problem might be a down router. It is also possible that there is an inadvertent misconfiguration of the firewall. Incorrect firewall setting may result to blocking of the name resolution traffic. A ping test may also be done. This is done by clicking run and type the command “ping”. Do this for every computer, to verify each workstation’s connectivity.

On the other hand, if the internal and external names or both are having problems in resolutions inside your network then this is a sign of a real DNS failure. However, if internal names are working properly, then there is no problem with the DNS server, it means is functioning well. If this is the case, there is an incorrect setting in the forwarder or it may be possible that a DNS server outside your network is down.

Trying to find out the causes of DNS failure should be the first thing to do. It is necessary to check for the simplest things first. The problem may be caused by a simple thing such as DNS server accidentally being switched off. It may also be caused by some incorrect settings between the connections of computers and DNS server in the network.

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Posted by Jodel X on Feb 6th, 2011 and filed under Computer, Internet. You can follow any responses to this entry through the RSS 2.0. You can leave a response via following comment form or trackback to this entry from your site