Error on https://validator.w3.org/

Why https://validator.w3.org/ analyze doesn’t work and gives 500 Can’t connect to www.xxxx.com:443 (certificate verify failed)

what has to be done? How do I fix it?

Looks like the security system that makes sure only browsers can access your site is blocking validator.we.org

If this is the case, I’m afraid that can’t be disabled

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Use the “Validate by direct input” option, then copy-paste your code.

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