Monday, March 25, 2019

Fix ERROR: zclient.IO_ERROR (invoke Connection refused, server: localhost) (cause: java.net.ConnectException Connection refused on Zimbra

Ever encountered this error " INFO: I/O exception (java.net.ConnectException) caught when processing request: Connection refused INFO: Retrying request ERROR: zclient.IO_ERROR (invoke Connection refused, server: localhost) (cause: java.net.ConnectException Connection refused)" on Zimbra.When you...

Zimbra Firewall Configuration with ufw for Ubuntu and firewalld for CentOS

In this guide, we're going to look at how to secure your Zimbra collaborative suite on CentOS 7.x and Ubuntu server using Firewalld and Ufw respectively. If your server...
Postfix Commands Administration Cheat Sheet

Postfix Commands Administration Cheat Sheet

Hello good people, here is a Postfix Commands Administration Cheat Sheet I made as a quick reference when administering Postfix. It contains most used postfix commands for troubleshooting problems. Postfix is...
installing postfix3 on centos 7

Installing postfix3 on CentOS 7

This guide will take you through the steps of Installing postfix3 on CentOS 7. Before diving to installation of postfix 3 on CentOS 7, let's first define what's postfix. What is Postfix? Postfix, designed by Wietse Venema,...
install cbpolicyd

How to Install cbpolicyd On CentOS 7

Hello good people, in today’s post we’ll have a look at how to install and get cbpolicy up and running on CentOS 7.x. We’ll cover installing Mariadb server the setting up...
Dockerizing Zimbra

Running Zimbra on Docker Container

I’ve been working on  Dockerizing Zimbra on CentOS 7 base image. The hard work has finally yielded fruits and in this post, I’m going to share my Docker Github repository which...