Practical Security Guides For Your Team

Your website's security certificate has expired. Think of it like an ID badge with a past-due date — browsers check this badge every time someone visits, and when it's expired, they show a full-screen warning telling visitors your site is unsafe. Most people will leave immediately rather than click through.

Your server's encryption setup has a misconfiguration in how it handles a specific downgrade-prevention signal. When a browser tries to detect whether someone is tampering with its connection, your server responds with the wrong error — like a smoke detector that beeps when you test it, but with the wrong tone. The protection may still be partially in place, but the server isn't behaving according to the standard, which can confuse security tools and warrants a closer look.

Your server is using a self-signed security certificate — one that you (or your server) created yourself, rather than one issued by a trusted authority. Browsers treat this the same way they'd treat a badge someone printed at home: it might look official, but there's no independent body vouching for it. Visitors to your site will see a security warning, and some browsers may block access entirely.

Your Windows server may be missing a critical security patch from 2014 known as 'WinShock'. This flaw exists in the part of Windows that handles encrypted connections (HTTPS), and an attacker could exploit it to take complete control of your server — without needing a username or password. If this patch is missing, your server is exposed to one of the most severe Windows vulnerabilities ever discovered.

Your web server is compressing responses using gzip or Brotli, which is a common performance feature. However, a known attack technique called BREACH can exploit this compression to gradually piece together sensitive data — like login tokens or session cookies — from your encrypted traffic. Importantly, this only becomes a real risk if your site also reflects user input and serves secrets (like security tokens) in the same page response.

Your website can be visited over plain HTTP (unencrypted), and it doesn't automatically send visitors to the secure HTTPS version. Any user who lands on an HTTP link — from an old email, a bookmark, or a mistyped URL — will have their connection left unprotected. Think of it like a shop that has a secure back entrance but leaves the front door unlocked with no sign pointing visitors to the right way in.

Your server still supports TLS 1.0, an old encryption standard from 1999 that has a known weakness called BEAST. Think of it like a lock on your front door that was recalled years ago — it still works most of the time, but security experts have shown it can be picked under the right conditions. Modern browsers and servers have largely worked around this flaw on their end, but the safest fix is to retire the old protocol on your server entirely.

Your website is missing a small but important instruction it should send to browsers — one that tells them to always use a secure, encrypted connection. Without it, browsers may occasionally connect over an unencrypted channel, and there is no browser-level safeguard to prevent that from happening. Think of it like a lock on your front door: your HTTPS certificate is the lock, but this header is the sign that tells visitors to always use the locked entrance.