https://techtreme.com/dnsprobefinished_nxdomain-error-identified-on-windows-mac-and-android

For those of you working with WordPress on a daily basis, errors specific to the CMS such because the white display of death or database connection error's are somewhat common occurrences. However, another subset of error's you will probably stumble upon are those tied to your internet connection and DNS. a very common error that Google Chrome users get when trying to browse to an internet page is DNSPROBEFINISHED_NXDOMAIN. this can be downright frustrating because suddenly you can not browse to your internet site or perhaps even anywhere at all.
If you are seeing this error while trying to get to your WordPress site, don’t worry, this is fairly simple to fix. check out the recommendations under on how to get connected again. this can also work for other browsers, such because Firefox, Edge, etc.

How to Fix DNSPROBEFINISHED_NXDOMAIN

Release and Renew IP Address

Windows
In Windows just open up command prompt via pressing the Windows logo key and R. Then type “cmd” and

Type in ipconfig /release and hit Enter. this will release your current IP address.

Then type in ipconfig /flushdns and hit Enter. this will flush your local DNS cache. you should see a “Successfully flushed the DNS resolver Cache” if it worked.

Then type in ipconfig /renew and hit Enter. this will renew your IP address.

You might also try resetting your IP settings and Winsock catalog with the following commands: netsh int ip set dns & netsh winsock reset.

An alternative way to flush and renew your DNS is simply via disabling your network adapter & re-enabling it.

Mac
To release and renew your IP address on a Mac, visit System Preferences…

Mac system preferences

Click on the network icon & then click “Advanced.”

Mac network advanced

Click the TCP/IP tab heading if you are not already in there. Then click on the “Renew DHCP” lease button.

Just like we did above in Windows, Mac customer can also clear their local DNS cache. Although this is done in a special place. visit Utilities and then click on “Terminal.”

Enter in the following command:

Fix DNSPROBEFINISHED_NXDOMAIN on Chromebook

Before you start, ensure that your Chromebook computer is connected to network (Wi-Fi or Ethernet)
Click on Time panel in the bottom right corner.
Now, click on Connected to [your network name].
Here, click Network.
Choose Google name servers option.

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For any incoming mail ,sophos ESA needs to do reverse DNS lookup (PTR Record) for incoming domain MTA before accepting connection and process mails.

This should be done at first level whenever sending MTA trying to make connection with our ESA MTA.

If incoming mail domain do not have valid PTR record,then connection should be rejected at that point before any processing / checking at ESA MTA policy level.

This is additional Anti-Spam technique to thwart spamming and spoofing based fraudulent mails.

This is also called Forward Reverse DNS lookup match.

A record of incoming MTA should exactly matched with PTR record of incoming MTA IP address for any legitimate incoming emails.

e.g
Our sophos ESA MTA is responsible for sending emails for our domain i.e opalindia.in

MTA DNS A record (smtp.opalindia.in ): 117.239.33.39
MTA Reverse DNS PTR record (117.239.33.39): smtp.opalindia.in

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