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Your DNS server might be unavailable. Windows can't find the well-known host...

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3 replies to this topic

#1 Rango789


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Posted 27 January 2018 - 01:59 PM

Hi all!

"Your DNS server might be unavailable. Windows can't find the well-known host "www.microsoft.com" using DNS"

Windows 10.

Wifi stopped working out of blue just for my Acer Nitro 5. Other devices connect just fine.

Tried all this found online but nothing worked

- restart router

- ping in cmd flushdns, and more cmds

- change manually ips and dns servers

- uninstall antivirus

- turn off firewall

- updating network connection drives

Been on it for hours. about to throw laptop by window.

HELP please!! (and please keep it simple as not very tech savvy°


Edited by Chris Cosgrove, 27 January 2018 - 05:33 PM.
Moved from Win 10 to 'Networking'.

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#2 jenae


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Posted 27 January 2018 - 07:36 PM

Hi, well you have tried a lot, usually when this occurs setting the DNS servers manually fixes this (I note you tried this).


Windows ten also includes a network reset option under Network\Internet settings in PC settings, this is supposed to reset all relevant settings, it is sometimes necessary to create a new connection after this, unfortunately someone at MS was not listening when we explained that this fails in regards to one setting because for security reasons this setting is access denied, so as this plays a role in your problem we have to do it manually.


All you really need to do is copy and paste.


Copy all below (highlighted in red to make it easier for you, does not need to be copied in red)

\registry\machine\SYSTEM\CurrentControlSet\Control\Nsi\{eb004a00-9b1a-11d4-9123-0050047759bc}\26 [7 8] 

Now open Notepad and paste this text into it. Next in notepad go to the main menu and under"File" select "save as" call it Resetip.txt and save it to desktop, the file is now located at %userprofile%\desktop

Next press the win + x keys together, from the menu select, Powershell(admin), a powershell prompt will open.


At the prompt type:- cmd (press enter)

An elevated cmd prompt will open within powershell.


Next at the cmd prompt (copy paste):-

regini %userprofile%\desktop\resetip.txt (press enter).


This will reset the registry permissions on the above registry key.(you will not see any indication of this the default prompt will simply reappear (means it has worked).

NOTE:- this permission change will revert to defaults after a restart, so it is perfectly safe.

Now still at the cmd prompt we copy paste:-

netsh int ip reset (press enter)

The tcp/ip stack is rebuilt. (at this stage do not restart computer)

Next:- copy paste:-

netsh winsock reset (press enter)

This will reset winsock

You will be asked to restart your computer, do so, please use restart not shutdown (important). Test your internet now, it might be necessary to open connection properties and reset the DNS settings, and it can take two restarts to work.


#3 lakshmohan


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Posted 19 October 2018 - 12:05 AM

There are several ways to fight against this error. Like you can try flushing out DNS or by simply resetting your Wi-fi router, even by resetting TCP/IP. Refer to this article - Your DNS Server Might Be Unavailable for more, and a brief info.

#4 Replicator


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Posted 19 October 2018 - 05:31 AM

Think the OP has long gone mate........thanks, but raising old threads with your first post ain't cool.

The quieter you become, the more you are able to hear!
CEH, CISSP @ WhiteHat Computers Pty Ltd


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