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Zimbra XXE / SSRF Vulnerability Disclosure

At March 18, 2019 , Rene Ottom, Vice President Product eMail and Collaboration announced that The Zimbra Security team has been...

How To Install Elasticsearch, Logstash, and Kibana (Elastic Stack) on Ubuntu 16.04

Introduction The Elastic Stack — formerly known as the ELK Stack — is a collection...

March 13, 2019: End-of-Life for All TLS-SNI-01 Validation Support

Let’s Encrypt allows subscribers to validate domain control using any one of a few different validation methods....

Netstat Cheatsheet

To view the total number of connections to a port, run the following command in ssh netstat -tuna |...

Hypervisor KVM

Have you ever wondered how a cloud works? It is the most fast-growing IT-trend which attracts billions...

How To Make Changes In resolv.conf Permanent in Ubuntu

When you change the DNS configuration using /etc/resolv.conf file, you must have noticed that the changes are not permanent. A reboot and...

Enable Nginx Status Page

Nginx status page can give realtime data about Nginx’s health. It can help you tweak few Nginx config. Status data can be...
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Proxmox 5x “e1000 driver hang” fix

Problem: I started to experience proxmox servers going up and down, an intermittent response on the network (SSH),...

How To Fix “Device eth0 does not seem to be present, delaying initialization” Error on Centos

check network: # ifconfig lo        Link encap:Local Loopback           inet addr:127.0.0.1  Mask:255.0.0.0           inet6 addr: ::1/128 Scope:Host           UP...

Create Blocking Bad Bots Through Apache in WHM/cPanel

we see a lot of traffic from 'bad robots', these bots cause problems such as high server load, server instability and can...

Tools for load-testing HTTP servers

Knowing how much traffic your web server can handle when under stress is essential for planning future grow of your website or...