How To Fix QC's DND Issue

Step 1. Release and Renew IP Address

Due to the fact that this is usually a client-side DNS issue, the very first thing you should do is try releasing and renewing the IP address on your computer. This also includes flushing your local DNS cache, which is similar to browser cache.

Windows

1. In Windows simply open up Command Prompt by pressing the Windows logo key and R or search run in your windows search bar - Then type cmd and hit Enter. 

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

2. 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.

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

Mac

To release and renew your IP address on a Mac, 

1. go to System Preferences…

1. Click on the network icon and then click “Advanced.”

2. Click the TCP/IP tab heading if you aren’t already in there. Then click on the “Renew DHCP” lease button.

Just like we did above in Windows, Mac users can also clear their local DNS cache. Although this is done in a different place. 

3. Go to Utilities and then click on “Terminal.”

4. Enter in the following command:

dscacheutil -flushcache

Note: There is no success message on Macs.

Step 2. Restart DNS Client Service

If you’re running Windows you can try restarting the DNS client services which resolves and caches DNS domain names.

1. Simply open up Command Prompt by pressing the Windows logo key and R. Then type “services.msc” and hit Enter.

2. Scroll down to “DNS Client,” right click on it, and select “Restart.”

If the restart option is grayed out for you (as it was for us), an alternative way to do it is via the command prompt.

1. Open up Command Prompt by pressing the Windows logo key and R or search run on your windows search bar.

2. Then type “cmd” and hit Enter.

Paste this:

Depending on the version of Windows you’re running you might get an error saying:

The requested pause, continue, or stop is not valid for this service. 

If you’re running into this error, do step 3.

Step 3. Change DNS Servers

Windows

1. In Windows simply open up Command Prompt by pressing the Windows logo key and R. Then type “control panel” and hit Enter.

2. Click on “Network and Internet” and then “Network and Sharing Center.” 

3. On the left-hand side, click on “Change Adapter Settings.”

4. Change adapter settings Right click on your current connection, this will either be Local Area Connection or Wireless Network Connection based on how you’re connecting. 

5. Then click on “Properties.”

6. Wireless connection properties

7. Select Internet Protocol Version 4 (or IPv6 if desired) and click on “Properties.”

Make a note of any existing settings in case you need to revert back. 

8. Click “Use the following DNS server addresses.” Enter the following, or replace the existing with these: (Only do this at the bottom part)

9. Click OK, then Close. 

Mac

To change DNS servers on a Mac, 

1. go to System Preferences…

2. Click on the network icon and then click “Advanced.”

3. Click on the “DNS” tab.

4. Then add Cloudflare’s DNS server addresses.

Step 4. Restart Your Computer

Reference: https://kinsta.com/knowledgebase/dns_probe_finished_nxdomain/