A DNS, or domain name system, error occurs when one portion of a network, such as the Internet, is not connecting properly to another portion of the network. This can occur because of a wide range of issues, from quick, easy-to-fix problems to more complex situations. DNS errors are one of the most common errors users receive while surfing the Web.
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One of the most common problems associated with a DNS error is a down network. A variety of issues can cause a network to go down. A single server in the system may not relay the information correctly to the next server. A setting may be wrong, or something as simple as a cord connected incorrectly to an added server can cause a DNS error.
If you've checked all the basics and you're still receiving DNS issues, you could have a DLL problem. A DLL, or dynamic link library, connects various items throughout a program together, creating a modular-like effect to save space and run more efficiently. Problems occur with the system when an update or other addition to the system overwrites one of the connections in the initial DLL, causing the system not to run at all. If the program with the DLL error is part of your website or is running through your website, a DNS error can appear to people viewing the site.