DNS outage: Meaning & Details

DNS outages can cause significant interruptions in business operations, so it’s essential to understand what they are and how to protect against them. A DNS outage, also known as a Domain Name System outage, is when an issue with the DNS server causes users to be unable to access the requested website or service. There are many different causes of a DNS outage, including malicious attacks, software and hardware errors, network congestion, and configuration errors. By having a DNS outage prevention plan and understanding the risks associated with DNS outages, businesses and individuals can ensure that they don’t experience any significant disruptions in their operations.

What is a DNS Outage? 

A DNS outage (DNS downtime) is a disruption in service on the Domain Name System (DNS), which is responsible for translating domain names into Internet Protocol (IP) addresses so that users can access online resources. An issue causes this outage with the DNS server, often due to an error, an attack, or a software or hardware failure. During a DNS downtime, users cannot access the requested website or service and often run into an error message. This can be a massive issue for businesses and individuals, as it prevents them from accessing crucial resources, services, and applications.

What Causes a DNS Outage?

There are many different potential causes of a Domain Name System downtime. One of the most common is an attack on the DNS provider by malicious actors, such as a DDoS attack, which floods the DNS server with too many requests and causes the system to become overloaded. Software or hardware errors can also cause a Domain Name System outage, as can an accidental modification to the DNS configurations resulting from human error. Additionally, a disruption in the power supply or hardware failure, such as a corrupted disk or memory, could also cause a DNS outage.

Another potential cause of a DNS outage is network congestion, when too much traffic is being sent or received at once, resulting in a backlog of data and an inability to process requests. In some cases, slow information propagation can also lead to a DNS outage, as the Domain Name System server may fail to recognize new changes to the system’s configuration. Finally, configuration errors due to incorrect setup or maintenance can cause a Domain Name System outage.

How To Detect a DNS Outage?

Detecting a DNS outage can be difficult, especially if you need to become more familiar with the inner workings of DNS servers and networks. But here are some of the most important ways to prevent your network against it:

  • Choose a reliable DNS service provider.
  • Back up (Secondary DNS) and test the DNS server system.
  • Implement authentication and data encryption.
  • Apply software updates to DNS servers and other methods.
  • Deploy Monitoring service tools and alerting systems.
  • Invest in security tools such as DDoS protection services.
  • Isolate internal networks from external threats.
  • Ensure secure configurations (DNSSEC) and limit access to the DNS server.
  • Regularly check for vulnerabilities in the system.

What are the most memorable DNS outages in history?

  1. The notorious “Dyn DNS” outage in October 2016 was caused by a massive DDoS attack, disrupting the internet for millions of people in North America and worldwide. 
  2. According to research from VeriSign, the average cost of a network incident caused by a DNS outage can be as high as $2.72 million. 
  3. Additive costs resulting from a Domain Name System downtime can include a 7-10% dip in customer satisfaction, lost time and resources due to troubleshooting, and decreased productivity or missed sales. 
  4. The United Nations estimates that each hour of lost internet connectivity can cost businesses up to $120,000 in lost revenue. 
  5. In June 2020, a significant outage occurred within the Amazon Domain Name System service resulting in downtime for millions of Amazon Web Services customers. 
  6. The peak DNS queries per second rate (DNS QPS) reached its highest levels when the pandemic hit, with over 1450 DNS QPS compared to the normal rate of 700-1000. 
  7. In October 2020, a significant downtime in Google’s DNS service caused service interruptions for services such as YouTube, Gmail, and Google Docs for several hours. 
  8. A recent report from Renesys estimates that 40% of global networks are vulnerable to DNS outages due to a lack of proactive prevention measures.


DNS outages can significantly impact businesses, so it’s essential to understand the risks and have strategies to prevent them. Ensure that you’re using a reliable DNS service provider, regularly update DNS software, and apply authentication and data encryption. Additionally, monitor and alert for any potential problems, use redundancy with other DNS providers to minimize the impact of an downtime, secure configurations, limit access to the DNS server, or isolate your internal networks from external threats. If a DNS outage does occur, you’ll be able to identify the source quickly and handle it properly. Having suitable measures in place can help your business to remain productive and secure.

What does DNS Spoofing stand for?

What does “DNS Spoofing” refer to?

DNS Spoofing, commonly referred to as DNS cache poisoning, is a cyberattack and phishing. Instead of directing you to the page you wanted to visit, it leverages the DNS servers to give your web browser the incorrect IP address. Due to this, DNS inquiries frequently return false positives, directing visitors away from safe websites and toward risky ones designed to steal personal information or distribute malware.

DNS Spoofing is possible because DNS was created in the 1980s when the Internet was much tinier. That means security was not a primary concern. However, since erroneous DNS information may exist until the time to live (TTL) expires or is explicitly updated, DNS resolvers need an internal mechanism to ensure the data’s accuracy.

Which are the preventive measures against it?

You can defend yourself from such an attack using a variety of methods. Some of them are as follows:

  • Encryption. Encrypt DNS data to keep it secure, including queries and responses. The security certificate for the original website cannot be copied.
  • Start using Email Authentication Protocols. Make all incoming traffic HTTPS-only.
  • Never click on unfamiliar links or suspicious ads. Avoid clicking on questionable URLs on a whim. These URLs typically come from unidentified senders and are joined to spam or social media posts. Users can protect their data by not clicking on them.
  • Virtual Private Network (VPN). Connecting to open networks entails more significant dangers. You can safely communicate with domains and engage in server interaction using a VPN.
  • Use Domain Name System Security Extensions (DNSSEC). It is created by ICANN and uses validation when they are put into use. Therefore, using DNS records that are digitally signed aids in data authentication. Consequently, DNSSEC makes sure that DNS lookups are safe.
  • DNS cache. DNS information from frequently accessed websites is kept for a while. So, it’s probable that the server wasn’t compromised but rather just the user’s device. Regular DNS cache cleaning is a wise move to stop the web browser‘s fake sites from being routed.


Both website visitors and owners may experience great inconvenience due to DNS Spoofing. The main reasons why an attacker launches a DNS Spoofing attack are either for personal gain or to spread malware. As a result, website owners must pick a trustworthy DNS hosting provider that uses modern security protocols and reliable detecting services.

DNSSEC – Why is it so beneficial?

Speaking bluntly, the Domain Name System (DNS) is the backbone of today’s big Internet. But such important creation got born without a security system. Without DNS, there’s no Internet, at least not in the comfortable way we know it now. Would you trust the Internet knowing that its backbone operates without security? Well, from here, you have a clue to know why DNSSEC is so beneficial. But we can go deeper!

DNSSEC definition

DNSSEC is how the security extensions to the DNS are named. It means Domain Name System Security Extensions. This group of security solutions was created to authenticate and protect DNS traffic. It’s the security layer of the DNS and the Internet that is needed to work safer. It adds cryptographic signatures to DNS records.

DNSSEC protects you, your online business, and regular users from obtaining malicious data. Tampered data will be detected, discarded, and not sent to users.

DNSSEC – Why is it so beneficial?

Security. DNSSEC is so beneficial because of the security features it provides. Through the use of asymmetric encryption, these extensions allow authentication of the information exchanged between DNS servers and, later, between them and the users’ applications.

Data origin authentication. DNSSEC extensions provide this important feature, so resolver servers can verify cryptographically that the data they receive really come from the zone where they originated.

Data integrity protection. Through DNSSEC, resolver servers can check the integrity of data. If data got altered in transit, meaning during the time that passed after it got signed through the private key of the zone by the zone owner, the resolver will detect that and won’t send the tampered data.

Trustable keys. It works with public and private keys to sign DNS records. Every zone has to publish its public key to make it available for resolvers. They all will need this key to verify data in that zone. Unfortunately, this public key can also be altered by criminals. The good news is DNSSEC provides the resolvers with a way to authenticate the public key too. It has to be signed, just like the rest of the data in the zone.

Prevention of cyber attacks. It allows you to avoid attacks like cache poisoning, man-in-the-middle, and more.

Easy installation. Install DNSSEC in the zones or the resolvers required only a few steps of configuration, and that’s it. From that moment, they can work safely, protecting you and all users.

Security base for more protocols. The development of the extensions keeps evolving. Every day, more protocols that demand data protection rely on DNSSEC. They (DEN, DKIM, DMARC, etc.) only work in zones that have been properly signed.

Security for end users. DNSSEC means protection for your clients, and they appreciate that. People look for trustable businesses to get the products and services they require.


DNSSEC is so beneficial to secure the vulnerabilities the DNS has. It makes both DNS and the Internet safer. Your business DNS data are vital. Don’t risk it! Sign with DNSSEC.

Heartbeat Monitoring: Definition & Benefits

Do you want to take advantage of Heartbeat Monitoring but don’t know how? Okay, no worries, you are in the right place. Why? Because in this article today, we will explore exactly this topic. So, first, we will begin with what Heartbeat Monitoring is, and then we will pass through what Monitoring service means. The next step is to review the main advantages of our topic. And finally, we will explain if it is easy to configure it and how to do it. So, let’s start.

Definition of Heartbeat Monitoring

For dependable service and an excellent user experience, Heartbeat Monitoring is essential. It also helps pinpoint problems with your services, such as web, DNS, email, etc. In addition, you get thorough information about the state of your servers thanks to it, and it makes it easier for you to identify and rapidly address various issues.

You may also keep an eye on and observe the health of your servers in real-time. This makes it simple to identify and address any issues, such as a specific component failing or extremely slow traffic.

Additionally, the Heartbeat Monitoring service sends out automated notifications. Therefore, you will be notified via email, text, or some other method if a problem arises.

Defining Monitoring service

Your team’s productivity will be greatly impacted if your IT infrastructure experiences any downtime because it will have a negative impact on how your customers are treated, which could lead to lost sales.

Therefore, the Monitoring service will aid in combating it. How? It will continuously monitor your IT infrastructure, notify us of any concerns, and enable us to take action before they have a negative impact on your organization. This will help keep your systems operational and your business stakeholders satisfied.

Advantages of Heartbeat Monitoring

  • It doesn’t miss a beat.
  • Checks at multiple locations
  • It is simple to use. Simple to configure.
  • Alerts you when your servers/devices go down
  • It comes with a set of additional monitoring checks.
  • An inexpensive solution

Is it easy to perform it?

Yes, it’s elementary. But first, you need to select a good Heartbeat Monitoring provider on the market. Some examples for them are Elastic, Cronitor, Site24x7, ClouDNS, Coralogix, etc. So, let’s get back to the question, “How and is it easy to perform it.” The steps are listed below.

  1. Select and enter the required information for your Heartbeat Monitoring to obtain the unique Ping URL.
  2. You must copy this URL and configure it for the server or any device you intend to test.
  3. When you do this, and your server opens the Heartbeat URL on a regular basis, your Monitoring check should return the status UP. It will be DOWN if you do not correctly enter the URL, your server is down, you have Internet problems, and so on.
  4. Examine and evaluate the performance reports.


In conclusion, we can say that this service is absolutely beneficial. It gives you additional security and is really easy and straightforward to perform. So, go ahead and reap the benefits.