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Seeing the below error when visiting the site.

“This site can’t provide a secure connection

growingswe.com sent an invalid response.

ERR_SSL_PROTOCOL_ERROR”

I see more and more of these types of errors, not only for me but also people posting message like GP just did: not necessarily that precise message but they're typically related to the security of the connection to the HTTPS website.

Why is this getting more and more common?

My pet (conspiracy) theory is ISP middle boxes toying with degrading/MITMing SSL.

My pet theory is that:

1. many people use Letsencrypt for website certificates

2. letsencrypt recently stopped automatically sending "It is time to renew your certificate" emails.

3. People (like me) got used to those emails and did not set up their own reminders.

4. The certificates expire and the owner (again like me) does not notice for several days.

Yeah, that's usually what happens. But many of those errors are TLS protocol errors, not expired certs.

An expired certificate causes a different error.

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