About cybersecurity | ssl security certificate

Is your DV certificate root certificate expired, causing client errors? Here's a solution!

Many friends who use DV certificates have encountered this situation: the website has just been renewed and the certificate is within the validity period, but someone reports that "the connection is not secure" or "the certificate has expired".

How is DNS hijacking accomplished? Three methods attackers use to tamper with DNS records.

DNS translates domain names into IP addresses; you can think of it as the internet's phone book. The essence of DNS hijacking is that attackers tamper with this "phone book," causing you to dial a scammer instead of the person you're trying to reach.

What if the results of local DNS resolution and public DNS resolution are different?

When you enter a URL and the page either won't load or redirects to a random ad page, but works perfectly fine using mobile data, it's highly likely a DNS resolution problem. The most direct sign is that the IP address retrieved using your local DNS

What are CAA records, CAA strategies, and CAA detection?

Those working in cybersecurity, or those responsible for managing company domains, have likely encountered this situation: a certificate suddenly appears under a domain name even though you haven't used one from a particular Certificate Authority

What is the purpose of CAA records? A security configuration to prevent SSL certificates from being incorrectly issued.

A CAA record is a DNS record with a single purpose: to inform Certificate Authorities (CAs) worldwide who is qualified to issue SSL certificates for your domain. By default, hundreds of CAs globally can issue certificates for your domain as long as

What are the symptoms of a website being DNS poisoned? Judge by these 5 signs!

DNS pollution can be roughly understood as "domain name resolution being swapped." Unlike a server failure that directly "goes on strike," it directs you down a "wrong path," preventing you from finding the correct destination. Many website owners,

Is it necessary for a regular company website to display an EV certificate?

Many business managers have a naive belief when choosing SSL certificates: the more expensive, the more secure; the higher the level of the certificate, the more legitimacy of the website. Therefore, when service providers recommend EV

This article explains the line priority rules for intelligent DNS resolution!

Many people, when configuring smart DNS, mistakenly believe that simply entering the IP addresses of their respective ISPs is sufficient. However, they often discover that Beijing Mobile users, despite having nearby Mobile nodes, are resolving to

Can intelligent DNS resolution solve the problem of slow access across different carriers?

For China Telecom users, websites load instantly, while for China Unicom users, it takes forever to load – this difference in network experience, where different operators cater to different users, often stems from cross-carrier access.

How long does it take for domain name resolution to take effect? 4 factors that affect the speed of activation!

The "domain name resolution taking effect" we often talk about refers to the process in the global internet's DNS (Domain Name System) framework where your newly modified resolution record (such as pointing a domain name to a new IP address)