Safari cannot open the page

I have been using my iphone on this site for years with no problems.
In the last week, I have been getting “Safari cannot open the page because it could not establish a secure connection to the server” message.
I tried clearing the cache and history and most of the other remedies offered on the net - all to no avail.
Apple’s page suggests that the forum operator has to up their security game.

Is anyone seeing this?

Looks ok to me.

Fixed.

After clearing all browser data it took a power-cycle to finish flushing whatever bad thing was in memory.

So
Close Safari app
Setting/Safari/Clear History and Website Data.
Hold down power button and then swipe to turn off.
Power back up.
Open safari and enter https://discourse.numenta.org
Log in.
Happy dance.

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