Quickly and easily assess the security of your HTTP response headers
📣︎ Heads up! New security scoring standards apply - Your website grade may have changed. MDN Observatory will launch soon. Learn More. The Mozilla Observatory has helped over 240,000 websites by teaching developers, system administrators, and security professionals how to configure their sites safely and securely.
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Check your CSR Remove cross certificates View browser warnings Check certificate installation Search certificate logs Check your SSL/TLS certificate installation Enter the URL of the server that you want to check.
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