DNS MX record is short for mail exchange. It is used to direct email to a mail server. The MX record indicates how email messages should be routed when we send out an email. The best way is to check dns MX record in Linux is using the dig command.  For example: dig domain.com mx …

DNS A record maps a domain name to the IP address (Version 4) of the server hosting the domain. The “A” stands for “address”. DNS A record indicates the IP address of a given domain. DNS A record is the most fundamental type of DNS record. It is one of the primary records used in …

A DNS, or Domain Name Server, is what helps translate human-friendly URLs into computer-friendly IP addresses. This is what enables our devices to connect to the internet and access the content we want to see. When people change their DNS, it’s usually to enhance either performance, security or both! Below, we’ll take a look at …

The OpenSSL s_client command is a helpful test client for troubleshooting remote SSL or TLS connections. This post covers various examples of testing SSL connections with different ciphers, TLS versions, and SSL server certificate analysis. OpenSSL s_client connect openssl s_client -connect example.com:443 Use the openssl s_client -connect flag to display diagnostic information about the SSL …

A port is a virtual numbered address that’s used as a communication endpoint by transport layer protocols like UDP (user diagram protocol) or TCP (transmission control protocol). Network ports direct traffic to the right places — i.e., they help the devices involved identify which service is being requested. For instance, the port that’s responsible for …

An SSL certificate helps to secure the communication between a client (such as a web browser) and a server (such as a website). If the certificate has expired, it can no longer be trusted to secure this communication, and an attacker may be able to intercept and view sensitive information being transmitted between the client …

An SSL cipher, or an SSL cipher suite, is a set of algorithms or a set of instructions/steps that helps to establish a secure connection between two entities. SSL cipher suites determine the method through which a secure connection will take place between both entities. This communication could be taking place through HTTPS, FTPS, SMTP, …

SSL (Secure Sockets Layer) connection is a connection that provides secure communications on the Internet for such things as web browsing, e-mail, instant messaging, and other data transfers. Although SSL was replaced by an updated protocol called TLS (Transport Layer Security) some time ago, “SSL” is still a commonly used term for this technology. How …

An SSL/TLS certificate is a file installed on a website’s origin server. It’s simply a data file containing the public key and the identity of the website owner, along with other information. Without a server certificate, a website’s traffic can’t be encrypted with TLS. SSL/TLS certificates are the most popular type of X.509 certificate. SSL/TLS …

We have two methods to use update-ca-trust or trust anchor to add a CA certificate on Linux. We need to install the ca-certificates package first with the command yum install ca-certificates. Understanding Root CA certificate SSL certificates operate on a structure called the certificate chain — a network of certificates starting back at the issuing …