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Bob LightningBob Lightning 

Communities: Safari can't open the page because safari can't establish a secure connection

Background

I have a public community page hosted on a custom domain with an SSL certificate.

I've checked the SSL certificate with SSL Checker, and everything is set up correctly.

It works for all the different browsers on Windows (10, 8.1, 8, 7, XP)
  • Chrome
  • Firefox
  • Edge
  • IE 11
But it just will not load on Safari on Windows (any version)

I get this error:

Safari can't open the page because Safari can't establish a secure connection

It does work on Safari on Mac OS:
  • Mojave
  • High Sierra
  • Sierra
But does not work with Safari on MacOS:
  • El Captain
  • Yosemite
  • Mavericks
  • Mountain Lion
  • Lion
  • Snow Leopard
Questions

What is causing this can't establish a secure connection message?
  1. What is causing the error to appear?
  2. How can I fix it?
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This question was re-posted from Salesforce Stack Exchange:

https://salesforce.stackexchange.com/questions/236085/communities-safari-cant-open-the-page-because-safari-cant-establish-a-secure
Khan AnasKhan Anas (Salesforce Developers) 
Hi Bob,

Greetings to you!

If a webpage is on a server doesn't meet secure cryptographic standards:
  • Safari will say that it will not open the website because it's using weak encryption. 
  • Or Safari will say that it can't open the page because Safari can't establish a secure connection to the server.

To resolve the issue, you should configure your server to be secure. Use modern cryptographic practices when setting up SSL and TLS services on your server:

https://support.apple.com/en-sg/HT204932

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future.

Thanks and Regards,
Khan Anas
Bob LightningBob Lightning
Hi Khan,

How do I achieve:

"you should configure your server to be secure. Use modern cryptographic practices when setting up SSL and TLS services on your server:"

Using Salesforce Communities?
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