DNS_PROBE_FINISHED _NXDOMAIN issue starts due to mismatching of IP address with the DNS of the computer. To be more technical, DNS converts the entire message from the domain end in the form of an IP address. Read more about what is DNS?
The real problem arises when a person feeds in the URL in their browsers; it is up to DNS to search the server with the appropriate IP address of the server. While in a general case, the searching process redirects to the target site, but on DNS failing, this will result in errors. This is when a browser flashes up the message “DNS_PROBE_FINISHED_NXDOMAIN” error.
Breaking up the message, NXDOMAIN, is the acronym for Non-Existent Domain. The error is very frequent in occurrence and there are working solutions for the same. Usually, different browsers offer various solutions, which work according to the server connection. For instance, in Google Chrome a message reading, “The Site can’t be reached” is flashed. For the case of Firefox, the message reads “Hmm. We’re having trouble finding that site.” Also read about How to fix your connection is not a private error in chrome?