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Why do I get Connection is Untrusted on one of my Apple computers and not the other one when going to the same website?

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I just loaded Firefox on my i-Mac and Mac Book computers. When I go to the same website on the i-Mac I get the message that the "the connection is untrusted" and if I go to the exact same site on my Mac Book I have no problem, the website successfully loads up and I can log into the site? What could be the difference that is causing me to get the untrusted message?

I just loaded Firefox on my i-Mac and Mac Book computers. When I go to the same website on the i-Mac I get the message that the "the connection is untrusted" and if I go to the exact same site on my Mac Book I have no problem, the website successfully loads up and I can log into the site? What could be the difference that is causing me to get the untrusted message?

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hello steve, please make sure the date & time is set correctly on the system where you getting the error, for other possible solutions see "This Connection is Untrusted" error message appears - What to do.