It's not your Mac - its the site you are trying to access.
Your Mac is telling you that when it tries to establish a private connection to the site, the site is not responding correctly.
If you can install Opera, you can install Chrome for Mac.
If your Mac is really so old, as to be running tech from last decade, get a new Mac.
Do you think that you should be able to stream Netflix on an old black and white CRT TV?
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