Few easy steps
I'll try to show you how to hopefully resolve the issue you have when browsing the internet. Specifically if it says your DNS server might not be available. So this should definitely be very tedious if you're using the Internet and all of a sudden you start getting this network changed. Error and basically it means you can't access the web page you're trying to get to. So and this brings the total. Follow method may help you resolve this problem.
So the first thing that you should do is actually a reset your modem or Internet connected device. So whether it means actually turning off the Internet on your physical laptop, or desktop or manually turning off the power to your adapter, and then waiting a few minutes or a couple minutes, and then turning it back on. I find that resolves a lot of this problems associate with this issue. If that does not do the fix for you guys I do have one further step we can take and that would be to right click on the start.
|Flush and renew your DNS|
Flush DNS will clear all your DNS cache stores in your computer. These cache may out-of-date or corrpted. Flush DNS will force Windows update DNS online by quiring nameservers.
For windows 10 and 8, press Win + x ( win is the key with Microsoft LOGO on your keyboard ), Right-click "Command Prompt" and select "Run as Administrator". For windows 7, click start button at your taskbar, and type "cmd" in the search box, and press enter .For windows xp or 2000, or vista, click start button at taskbar, click "run", and press enter .
Type follow command and press enter
You will see message tell you DNS flushed as below.
Repeat with follow command:
Close the command window and restart your computer, check if error fixed.