FQDN

What is FQDN? What does FQDN do?

FQDN, another hard-to-pronounce abbreviation. You don’t really need to know it to get a domain and set it up, but for the more curious of you, here it is.

FQDN

FQDN means Fully Qualified Domain Name. It is the fullest possible domain name of a host or a computer, on the internet. Here you can see the syntax of it:

[hostname].[domain].[tld]

It can also include a subdomain. The subdomain is not the hostname. It is just a part of the domain. 

Let’s see an example with Cloudns.net. We read it from right to left.

www.cloudns.net

First is “.net”, which is the top-level domain. Then it follows the domain name “cloudns”, and the last is the hostname “www.”. 

The hostname can show a specific service or protocol for the domain like “mail” or “ftp”.

The FQDN serves to show the exact location of an object inside the DNS hierarchy.

PQDN

PQDN is Partially Qualified Domain Name. It is just a part of the complete domain name. Let’s use our domain name again. The PQDN is, for example, “cloudns.net”. In this one, we don’t have the host “www.”.

How to make a FQDN lookup?

You can perform a FQDN lookup on your computer with any of the popular OS.

Windows 10. Go to “control panel” and click “system.” You will see it next to the “Full Computer Name.”

MacOS – Open the terminal, type “hostname –f”, and then press the enter button. You will see the FQDN.

Linux – similar to the MacOS, open the terminal, but this time type “hostname –A”.

Why do you need FQDN?

You will need FQDN to make a device accessible on the internet. You will use it to configure your DNS and get an IP address.

Another use case is when you want to get an SSL certificate. Today, almost every site has one, and you need to provide the FQDN to obtain it.

Remote Access. The DNS server will perform a lookup in its registers and resolve the FQDN to the correspondent IP address.

Access a protocol or a service. If you want to use a FTP for example, you will need the Fully Qualified Domain Name or IP. Also, for setting up email for specific applications, you will need it.

Conclusion

Fully Qualified Domain Name is used all the time, even if you don’t see it directly. It is the full identifier of the domain names. 

DNS_PROBE_FINISHED_NXDOMAIN

DNS_PROBE_FINISHED_NXDOMAIN, now what to do?

Imagine the situation, you are browsing the internet, minding your own business and suddenly you see DNS_PROBE_FINISHED_NXDOMAIN in your Chrome browser! You didn’t enter the page you wanted, you hit refresh and still nothing! Now, what to do?

What is DNS_PROBE_FINISHED_NXDOMAIN?

It is a DNS-related error that shows that the domain that you are trying to reach does not exist (NX means non-existing). The DNS can’t find the corresponding IP address to the domain you just entered.
Most of the times this is a DNS configuration problem, and the problem is in your device, not in the domain itself.

Ok, we said Chrome, but does this happen when you are using other browsers?

We mention Google Chrome, where you get “This site can’t be reached,” but you can get a similar message in any other browser. Mozilla’s Firefox will show you “Hmm. We’re having trouble finding that site”, Microsoft Edge “Hmmm… can’t reach this page”, and almost identical messages on the rest of the browsers.

Ok, so what to do when we see the DNS_PROBE_FINISHED_NXDOMAIN?

There are several ways that you can fix your problem. Let’s explore the possibilities:

1.    Flush the DNS cache

If it is bad-configured DNS, the easiest is to start from zero. Flush the current DNS cache and renew the IP address.

For Windows users, follow these steps:
Open the Command Prompt as an administrator. Click the start menu icon and write “Command Prompt,” then run as administrator. Then type “ipconfig /release” and press Enter on your keyboard. Now you can see your current IP address. After that, write “ipconfig /flushdns” and press Enter. You flushed the cache, “Successfully flushed the DNS Resolver Cache.” Next thing to type in “ipconfig /renew”. And now your IP address has been renewed.

Flush DNS to fix DNS_PROBE_FINISHED_NXDOMAIN

For Mac OS users:
Go to “System Preferences…”, then “Network” and later “Advanced.” When you are there, go to TCP/IP and click the “Renew DHCP.”
You can also delete the DNS cache. First, open the “Utilities” and then the “Terminal.” The command you need to write is “dscacheutil –flushcache” and press Enter. It is ready. There is no confirmation message here.

Mac OS fix DNS_PROBE_FINISHED_NXDOMAIN

For Linux (Linux Mint, Ubuntu):
If you are using Linux Mint or Ubuntu, by default, the DNS cache is disabled. You can check if it is enabled with the following command “ps ax | grep dnsmasq”. In the message that you’ll get check if “cache-size=0”, then it is disabled. If it is enabled, write the following command “udo /etc/init.d/dns-clean restart”. Then type “sudo /etc/init.d/networking force-reload”. Done!

Linux Mint fix DNS_PROBE_FINISHED_NXDOMAIN

2.    Reinitiate the DNS Client Server.

For Windows users, we will use the “Run” to open “services.msc.” Now you will see all the services that run on your computer. Go to DNS Client, stop it and start it again.

Restart DNS client to fix DNS_PROBE_FINISHED_NXDOMAIN

3.    Change the DNS servers

Your internet provider automatically set your IP address, using their DNS servers. But you have the chance to change to another DNS server like Google’s public DNS.

Windows:
Go first to “Control Panel,” then “Network and Internet” and later “Network and Sharing Center.” There click the “Change adapter settings” and select the network that you are using. Go to properties, search for the “Internet Protocol Version 4” and click on the properties. Set the following DNS servers 8.8.8.8 and 8.8.4.4

Mac OS:
“System Preferences,” Network,” and then “Advanced.” Click on DNS and add the same 8.8.8.8 and 8.8.4.4.

Mac OS DNS settings

Linux (Linux Mint, Ubuntu):
Open “System Settings,” “Network.” Then select the network that you are using and choose “Settings.” Go to the “IPv4 Settings,” and there you will see “Additional DNS servers.” add “8.8.8.8, 8.8.4.4”.

Linux Mint DNS settings

4.    Chrome Flags Reset.

Maybe the problem comes from your Chrome browser. Go to your Chrome browser and type “chrome://settings/clearBrowserData” in the address bar. Delete the “Cached images and files,” “Cookie and other site and plugin data” and “Browsing history” from “the beginning of time.”
After that type “chrome://flags/” and a menu will open. Click on the “Reset all to default.” Now restart the browser, and you are ready.

Google Chrome flags reset to default

Conclusion

Next time when you see the DNS_PROBE_FINISHED_NXDOMAIN don’t panic. There are easy solutions to this problem. Just try one of those, and you will be ready is a few minutes.
If the site that shows the error is yours, and after trying nothing is happening, go and check if the domain is correctly redirected. If no, do fix it.

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