Sys Admin Guides, How To's, etc by Marios Maravelias

You can check what connection you have via smtp protocol with the simple command:

netstat -a | grep smtp

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During the life of a website, its quite common for pages to move around or to ‘re-structure’ your site’s files and folders. However, you can come across issues when people linking to your page go to their ‘stale’ bookmark of your site, and find that page is missing – in fact, they’ll get a ‘404 Page Not Found‘. The same will go for search engines like google and yahoo, and will adversely affect your rankings within their results.

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Scope

Some idiot created a SSH worm that uses a dictionary attack to try to log into a computer over port 22. The worm tries to set up shop on your computer and tries to find the next vulnerable computer. This clogs up networks with bazillions of SSH login attempts.

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Read the fine article here.

What is a null route?

A null route is a route that goes to nowhere.

The reason for creating a null route is to prevent your system from sending any data to a remote system.

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APF Deny ALL for SSH – Limit IP Connections

APF firewall can deny ALL connections for ssh and allow only a single or select few of IPs to connect to your server. We’ll guide you through DENY ALL with APF firewall.

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