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safari can't establish a secure server

I just started getting this when going to sites I've used for years. Haven't made any changes, so can anyone tell me how to fix it?

iMac 21.5″, OS X 10.11

Posted on Jul 21, 2021 10:24 AM

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Question marked as Top-ranking reply

Posted on Jul 21, 2021 10:51 AM

Go step by step and test.


1. Quit Safari, launch Safari holding the Shift key down.

    https://support.apple.com/en-us/HT203987


2 Remove anti-virus software if installed on your Mac.


3. If Safari doesn't open a webpage or isn’t working as expected

https://support.apple.com/en-us/HT204098

4. If Safari says it can't establish a secure connection, or the website is using weak encryption

https://support.apple.com/en-us/HT204937

2 replies
Question marked as Top-ranking reply

Jul 21, 2021 10:51 AM in response to coastalcove

Go step by step and test.


1. Quit Safari, launch Safari holding the Shift key down.

    https://support.apple.com/en-us/HT203987


2 Remove anti-virus software if installed on your Mac.


3. If Safari doesn't open a webpage or isn’t working as expected

https://support.apple.com/en-us/HT204098

4. If Safari says it can't establish a secure connection, or the website is using weak encryption

https://support.apple.com/en-us/HT204937

safari can't establish a secure server

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