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Security Advisory – TCP SACK PANIC – Kernel vulnerabilities – CVE-2019-11477, CVE-2019-11478 & CVE-2019-11479

Redhat Ubuntu reference:https://access.redhat.com/security/vulnerabilities/tcpsackhttps://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-11477.htmlhttps://github.com/Netflix/security-bulletins/blob/master/advisories/third-party/2019-001.md Primarily Impacted Products Red Hat...

Zimbra Server Status shows all failed services

Step by step guide to solve problem zimbra some services are not running the following: To fix this issue:Check...

How to stop bad bots from visiting your website

Recently I noticed in Google Analytics a lot of referral to the page https://www.mydomain-name.com//h/1486338.html that doesn’t exist on one of my website....

Cannot access disk on zfs, Don’t Panic!!

I was having an issue with one of my Proxmox 5.0 version. When I was trying to start my VM it states...

Active-Active vs Active-Passive High Availability Cluster

Overview The two most commonly used high availability (HA) cluster configurations are active-active and active-passive. What’s the difference between...

Disable MySQL Strict Mode

This is enabled by default, but you can disable it in one of a couple ways.

Bash For Loop Examples

for loop syntax How do I use bash for loop to repeat certain task...

Vim Cheat Sheet

Global :help keyword – open help for keyword:saveas file – save file as:close – close current paneK – open man page for word under the cursor

Set-Up Master-Slave Replication for PostgreSQL 9.6 on Ubuntu 16.04

What we will do: Install PostgreSQL 9.6.Configure MASTER Server.Configure SLAVE Server.Copy PostgreSQL Data from MASTER to SLAVE.Testing.

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...

The 3 Pillars of Email Authentication: SPF, DKIM, DMARC

If you’re an email marketer or maybe troubleshooting with email issue, you’ve probably heard acronyms like “SPF,”...

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...
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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...