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Website security checklist for Australian small business: 7 things to verify yourself

My website says the certificate has expired - what do I do?An expired certificate means the digital proof that secures your HTTPS connection has passed its renewal date, so browsers now warn visitors away with a full-page security error.
What is a self-signed certificate and why does the browser reject it?A self-signed certificate is an HTTPS certificate you issue to yourself rather than obtaining from a recognised certificate authority.
What’s the difference between TLS 1.2 and TLS 1.3?TLS 1.2 and TLS 1.3 are two versions of the protocol that encrypts the connection between a browser and your website; 1.3 is the newer, faster and more secure one.
What is a WAF and does my small business need one?A WAF (web application firewall) sits in front of your website and inspects incoming traffic, blocking common attacks before they reach your pages.
Is my website exposing its file directories?Directory listing is when a web server, asked for a folder that has no index page, responds by showing the raw list of files inside it instead of an error.
Are my admin and login pages exposed?Most websites have an admin or login page at a predictable address - /wp-admin for WordPress, /administrator for Joomla - and attackers scan for those addresses constantly.
Do I need to keep my CMS, plugins and themes updated?Yes - out-of-date website software is one of the most common ways small business sites get compromised, because attackers scan the web for the exact flaws that each update fixes.

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Why is your small business website slow?