Transport Layer Security (TLS) is a technical term for secure communication between two computers. These days, when we say TLS we mean the existence of HTTPS on your website. HTTPS, like any other standard in the world keeps evolving with time (as encryption methods get outdated, for example) and as a result, new versions are released.
And that is what the TLS tool does: it tells you which versions of TLS your website supports, and which encryption algorithms are being used.
Simply having HTTPS enabled is not enough. Computer security is a moving target, and things that were considered infallible a decade ago have now been abandoned. The TLS test can tell you how strong your HTTPS security is. If you find that you don’t have the latest version, you must (absolutely must) get your hosting provider or CDN to upgrade it.
You may also check out this guide to implement TLS 1.3 in Apache and Nginx web server.
Secure Headers Test
Check if your site has secure headers to restrict browsers running from avoidable vulnerabilities
Check how quickly your server responds to the requests made by the browser
Check the supported protocol, server preferences, certificate details, common vulnerabilities and more
Broken Link Checker
Check if your web page contains internal or external broken links
Find out the hosting provider of any site, quickly
DNS Record Lookup
DNS lookup for A, TXT, MX, SPF and NS records
Website Performance Audit
Find out how does your site perform against more than 40 essential metrics
HTTP Headers Checker
Test the headers are being advertised by your web server or network edge device
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