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Your HTTP cert is invalid. Just a heads up.

It's fine for me and was issued May 26. The URL when I visited was https://commaok.xyz

His browser might have oppened the following link: https://www.commaok.xyz/post/no-line-numbers/ somehow.

It's serving a certificate for github.com.

There's an error for https://www.commaok.xyz/, for what that's worth.

If it's showing up as invalid for you, you may have locally revoked trust of the DST Root CA X3 IdenTrust root certificate.

The www subdomain serves the wrong cert. https://www.commaok.xyz/ gives you an SSL error but https://commaok.xyz/ does not.

Hi : unrelated to this thread.

In an older thread you mention an acronym TFA. The thread was a discussion on sparse files and removing bytes from the front of a file.

What is TFA?