GuideServers + Cloud ComputingWebsites, HTTP, HTML, PHP, and related services Test websites to detect issues, security settings, etc - Web Based Tools Updated August 30 2024
Security Headers
https://securityheaders.com/

Scan websites for issues/malware with urlscan.io
https://urlscan.io/


SSL/TLS Website Testing
https://www.ssllabs.com/ssltest/

https://www.sslchecker.com/

https://pentest-tools.com/network-vulnerability-scanning/ssl-tls-scanner

Test Bad SSL/TLS Certs using badssl.com
https://badssl.com/

https://www.sslchecker.com/

DigiCert SSL Installation Diagnostics Tool
https://www.digicert.com/help/

https://www.wormly.com/test_ssl

Check the OCSP Stapling of TLS Certificates:
https://certificatetools.com/ocsp-checker

HTTP, HTTPS, Email
https://internet.nl/


Test if websites are working properly
https://downdetector.com/

https://downforeveryoneorjustme.com/

https://validator.w3.org/

https://www.browserling.com/

https://mxtoolbox.com/SuperTool.aspx

Check if DNS for your site has replicated properly
https://www.whatsmydns.net/

https://urlscan.io/


Thinkst Canary offers this Canary Generator which can alert you when something happens, such as a URL being visited, or a special email address receiving an email.
https://canarytokens.org/generate



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