Common DNS Issues

 Running into an error with the Domain Name System — simply called a DNS error — means you won't be able to get access to the internet, which is frustrating if it happens regularly. Learning the most common causes of DNS issues and the best methods for fixing them can help you get back online with minimal effort. Essentially the DNS translates the domain names we use to access websites into IP addresses, which is what your computer actually uses to access the website. In most cases, a DNS problem is easy to fix

Network Problems

In many cases, an error attributed to DNS could be a simple connection problem (especially if you're connecting wirelessly using a laptop) that doesn't really relate to the DNS at all. Before blaming DNS errors, go to your "Network and Sharing Center" and run the troubleshooter. This will identify and fix many common connectivity issues and can help you narrow down the cause of the issue.

Duplicate IP Addresses

When two devices attempt to share a single IP, you see the dreaded “Address Already in Use” error — with no ability to access the network.

The Quick Fix: The blame for this often rests with your router’s default DHCP configuration. DHCP is probably trying to assign your new device an address at the beginning of your subnet, and another device may already occupy these low-numbered addresses with static IPs. If you’ve just introduced a new device or server to your network, it may have its own DHCP server. Simply disable the DHCP server on that device to restore sanity to your network.

Common DNS Issues: TCP/IP

One of the most common causes of DNS errors is the TCP/IP software, or the Dynamic Host Configuration Protocol (DHCP), which assigns IP addresses to devices and handles the DNS server addresses. The simplest way to rectify these issues is simply rebooting your computer, but you can also use a TCP/IP utility program to fix your settings.

Finally, it's also worth checking that your router and the device you're using have DHCP enabled, because if one of the two doesn't, this can lead to connection problems.

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