Introduction The error “554 5.7.2 Service denied, closing transmission channel” occurs when the recipient mail server refuses to accept an email connection from the sender’s server. This is generally caused by spam protection systems, blacklisted IP addresses, incorrect mail server configuration, poor sender reputation, or failed authentication checks. Mail servers… Continue Reading Remote host said: 554 5.7.2 Service denied, closing transmission channel

Introduction Server security is critical for maintaining the integrity, confidentiality, and availability of your data and services. If you suspect unusual activity on your Linux server, it is important to investigate immediately to determine whether the system has been compromised. By checking user activity, running processes, network connections, and suspicious… Continue Reading Check if the server is hacked or not

Introduction This guide explains how to install the Zend Framework module via RPM on a Linux server using EPEL or REMI repositories. It covers basic, full, and custom installation options, along with steps to verify the installation by creating a sample Zend project and testing it in a browser. 1.… Continue Reading Install Zend module via RPM

Introduction cPHulk is a security feature in cPanel/WHM that protects the server against brute force attacks by temporarily blocking IP addresses after multiple failed login attempts. Sometimes legitimate users may get blocked and encounter errors such as: or Normally, administrators can whitelist the IP address through WHM → Security Center… Continue Reading cPHulk Brute Force Protection – Remove IP Address from Database

Introduction In a cPanel server, email spam issues are common when a compromised email account, website script, or infected application starts sending bulk emails through the Exim mail server. Detecting such spammers quickly is important to prevent blacklisting of the server IP, high server load, and delivery failures. Exim provides… Continue Reading Detecting Spammers in Exim Server (cPanel)

Introduction Joomla plugins extend the functionality of a website by adding features such as caching, authentication, editors, and system-level operations. In some situations, administrators may need to temporarily disable a plugin for troubleshooting, performance optimization, or compatibility testing. This guide explains how to disable a Joomla plugin, specifically the System… Continue Reading How to disable Joomla plugin ?

Introduction Changing the Administrator password regularly is an important security practice for maintaining the safety and integrity of a Windows Server 2003 system. Updating the password helps protect the server from unauthorized access and ensures better control over administrative privileges. This guide explains the step-by-step process to change the Administrator… Continue Reading Windows server 2003 Admin password change

Introduction Apache OpenMeetings is an open-source web conferencing and collaboration platform that provides features such as online meetings, video conferencing, chat, whiteboard sharing, and online training sessions. This guide explains how to install OpenMeetings on a Linux server, including the required dependencies such as Java, OpenOffice, FFmpeg, ImageMagick, Ghostscript, and… Continue Reading OpenMeetings Installation on Linux Servers

Introduction The Anti-Spam SMTP Proxy (ASSP) is a popular email filtering solution used to protect mail servers from spam and malicious emails. In some cases, legitimate domains or email addresses may be incorrectly flagged or blocked by ASSP, causing valid emails to be rejected or filtered as spam. This guide… Continue Reading How to Whitelist a Domain or Email Address in ASSP Spam Filter

Introduction Website performance plays a crucial role in user experience, search engine rankings, and overall server efficiency. One of the easiest ways to improve page load times is by enabling browser caching and content compression through the .htaccess file. When the Apache modules mod_expires and mod_headers are enabled on the… Continue Reading Improve Website Performance Using .htaccess Browser Caching