SSL sites only loading on Firefox (not Safari OR Chrome)

On our older machine running El Capitan, sites that have valid certificates are blocked as not trustworthy. I can look at the certificates and they ARE valid, within date and everything, but the browsers seem to think they've expired.

Oddly, Firefox doesn't have this problem, just Safari and Chrome (both updated).

This behavior has only started recently. Any theories or suggestions?

MacBook Air 13″, OS X 10.11

Posted on Oct 26, 2021 11:48 AM

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Showing SSL error for genuine sites (links from google search results) and then getting routed to spam advertising sites. I am facing this problem on both my iPhone and on my Macbook. The Safari is showing links for google search results as not having valid SSL certificates. When I click proceed to site, I get routed to this IP address always - http: //89.208.103.43. From there, the browser automatically shows many spam Advertising sites. This happens simultaneously on my iPhone as well as on my Macbook. This is only on Safari. If I use Microsoft Edge, this problem vanishes. When I go back to Safari, the same problem is seen. I have tried resetting the Safari on Iphone and clearing website data and cookies on Safari, Macbook. Still the problem somehow comes back. I am also worried about Malware or something like that installed in my devices. Please help. [Link Edited by Moderator]
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SSL sites only loading on Firefox (not Safari OR Chrome)

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