Fix NGINX Error: could not allocate new session in SSL session shared cache “le_nginx_SSL” while SSL handshaking

A typical web server error with NGINX and Certbot, which I recently discovered in error.log: It is an error that occurs sporadically, only in certain scenarios and most often on high traffic websites. Large number of queries. "Le_nginx_SSL", as can be deduced from the name, is responsible for the SSL sessions served… Read More

Fix SSH Error in Terminal & Linux: client_loop: send disconnect: Broken pipe

The most secure connection to a remote server is through an SSH (Secure Shell) cryptographic network protocol. A common problem encountered by server administrators or those who make connections via SSH via Terminal or Putty, is the sudden disconnection from the session with the message: "client_loop: send disconnect: Broken pipe". Most… Read More

How to replace FirewallD with iptables on CentOS 7

Bot attacks and malware applications on websites are the order of the day, and companies that offer security solutions try their best to keep up and face daily challenges. In addition to complex software applications, able to identify, analyze and automatically block computer attacks on a web server,… Read More

Fix Error: SMTP 451 (Temporary local problem - please try later)

One problem that many server administrators face right now is a less common SMTP error that occurs when sending an e-mail message. SMTP 451 (Temporary local problem - please try later) This is not a hacking or problem caused by an error… Read More

Fix Error: Your PHP installation appears to be missing the MySQL extension which is required by WordPress

“Your PHP installAtion appears to be missing the MySQL extension which is required by WordPress ”is an error encountered by many blog owners and websites with WordPress. It is not a cause for concern. The lack of the MySQL extension in PHP is typical of operating systems installed from scratch, VPS or dedicated servers, where PHP extensions do not Read More

Content Encoding Error / Cannot Decode Raw Data (Fix Error NSURLErrorDomain)

“Content Encoding Error”Or“ Cannot Decode Raw Data ”is the same error, the message being different from one internet browser to another. This error can occur when we try to access a web page from your computer or mobile phone. Safari users also receive an error code following the message: NSURLErrorDomain - Read More

What is SELinux and solving “Failed to load SELinux Policy” on CentOS / RHEL [Fix]

First of all, let's make a brief description of SELinux. What is SELinux and what role does it play on the Linux operating system? SELinux is a kernel security module, which has the role of controlling the access of software applications and users, on the operating system. Released around mid-2000, Read More

Zsh Vs. Bash in macOS Catalina

With the launch macOS Catalina, besides the many novelties and features, Apple also introduced Zsh (Z shell) instead of Bash (Bourne-again shell). Users familiar with the Bash scripts and interactive command lines in the Terminal quickly noticed this change. In the Terminal it is suggested to execute a command line to make the transition from… Read More