server DNS address could not be found

Question

I've very serious issue with my system or network, some of the websites doesn't open and it's just displaying server DNS address could not be found

I've tried to change DNS settings with Google public DNS:

Preferred DNS server : 8.8.8.8 
Alternate DNS server : 8.8.4.4

And with open DNS:

Preferred DNS server : 208.67.222.222 
Alternate DNS server : 208.67.220.220 

Also tried with following commands:

ipconfig /flushdns
ipconfig /registerdns
ipconfig /release
ipconfig /renew
NETSH winsock reset catalog
NETSH int ipv4 reset reset.log
NETSH int ipv6 reset reset.log

And lot more things. But could not find solution any! I've also refereed :

Chrome gets stuck on “server DNS address could not be found” if I tried to access a domain while connecting

“DNS server address couldn't be found” for some websites

Site can't be reached- server DNS address could not be found

But no luck so far, can anyone let me know, what is the issue and how can I resolve it?

Updated:

Sites are not working on my system are:

https://cdnjs.cloudflare.com/ajax/libs/remarkable/1.7.1/remarkable.min.js

https://cdnjs.cloudflare.com/ajax/libs/react/15.3.2/react-dom.js

https://cdnjs.cloudflare.com/ajax/libs/react/15.3.2/react.js

https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.23/browser.min.js

I've checked with my another system which has fresh OS installed, and this all sites are working perfectly on it.

Moreover, I've checked wit uninstall my antivirus, but It couldn't solve my issue.

Answer 1

The poster has shown two URLs that he is unable to accede and which I tried from here (Europe):

1. The first URL was a cloudflare address that worked for me, so might indicate a problem with the cloudflare server in India or its cache.

2. For the second URL I got the error "Firefox can’t find the server at node-iltorb.s3.amazonaw", so this site has a real problem and was down when I tried.

The problem can also be on your side, where the usual responsible is the anti-virus or other security software. Booting in Unsafe mode with Network is a quick way of telling if the problem is caused by a non-Microsoft product.

Answer 2

Server DNS address could not be found

Try reinitialising the network states. Run the following commands in an elevated cmd shell in this order:

• Reset WINSOCK entries to installation defaults:

  netsh winsock reset catalog

• Reset TCP/IP stack to installation defaults:

  netsh int ip reset reset.log

• Reset Firewall to installation defaults:

  netsh advfirewall reset

• Flush DNS resolver cache:

  ipconfig /flushdns

• Renew DNS client registration and refresh DHCP leases:

  ipconfig /registerdns

• Flush routing table (reboot required):

  route /f