security Archives » Vander Host Knowledgebase

The quickest way to find brute force attackers on a server using Netstat

Step 1. Identify the bastard: netstat -an | grep ‘:443’ | grep ESTABLISHED | awk ‘{print $5}’ | cut -d: -f1 | sort | uniq

Emails from StandardBank.co.za to a cPanel hosted server fails with bodyhash_mismatch – DKIM issues

cPanel bodyhas_mismatch Emails from StandardBank.co.za to a cPanel hosted server fails with bodyhash_mismatch – DKIM issues Email from standardbank.co.za might fail with bodyhash_mismatch. Since it’s

How to password protect an NGINX website

Here are the steps to password protect an NGINX website: 1. Logon to the server You need SSH to solve this problem. 2. Create a

Excessive logging of TCP_IN Blocked messages on a WHM server

Background Whilst observing a WHM/cPanel’s log file using tail -f /var/log/messages you might observe 1000s of events, sometimes every few seconds, similar to the following:

Failed to load nf_conntrack module when starting FirewallD

Problem Description Upon starting FirewallD you might encounter the error listed hereunder. This particular behavior was observed on a new installation of Virtualmin/Webmin. Sep 19

How to enable SSH for GCE

If you’re hosting a Linux box with Google Cloud Engine, SSH will be disabled by default. There are pretty good reasons for this, especially brute

Access to font at xxx from origin yyy has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource

About CORS Cross-origin resource sharing is a way to share libraries and fonts across multiple servers. However, in order to avoid security issues, many servers

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