Security
Security certificate covers this domain
security.certificate-name-mismatch
Why this matters
A certificate has to be issued for the domain it is serving, by an authority browsers recognise. One that names a different domain, or that a server issued to itself, is treated exactly like a fake: a full warning page before anybody reaches you, deliberately difficult to click past.
Who fixes it
A developer
Roughly how long
Varies
Care needed
Test before and after
How to fix it
Reissue the certificate including every domain the site answers on — usually both the bare domain and the www version.
How we score it
Failing this check takes up to 30 points off your security score. It is a fact about your site rather than a measurement, so it reads the same on every scan until you change something.
Does your site pass this one?
This check runs on every scan, along with the other 106. Free, no account, and you see the evidence for each result.
Check my siteOther security checks
- A content security policy is in placeA content security policy tells the browser which scripts it may run. Without one, anything that manages to get injected into a page — through a compromised plugin, a hijacked advert, or a comment field — runs with the same trust as your own code.
- Browsers are told to stay on HTTPSYour site works over HTTPS, but it never tells browsers to remember that. The very first visit of the day can still be sent over an insecure connection before the redirect happens, which is the window an attacker on shared Wi-Fi needs.
- Camera, microphone and location access are restrictedAnything embedded in your pages — an advert, a chat widget, a map — can ask the visitor for access to their camera, microphone or location, and the request appears to come from you.
- Cookies are only sent over an encrypted connectionA cookie without the Secure flag is sent over a plain, unencrypted connection as readily as over an encrypted one. Anyone sharing a network with the visitor — a café, a hotel, an office guest network — can read it, and a single request to the http version of the site is enough to expose it, even when every page normally redirects to https. The flag costs nothing and there is no reason for a cookie on a secure site to be missing it.
- File types cannot be second-guessedWithout this header a browser may ignore what your server says a file is and guess instead. An uploaded image that is secretly a script can then be run as one.
- Folders are not browsableYour server is showing a file listing instead of a page. Anyone can read it and see exactly what is in that folder — backups, spreadsheets, database dumps, anything left there and forgotten.