Thanks @Osiris!
It is true that overly modifying the security configuration of the server to accommodate one browser is not best practice to say the least. And is not recommended.
Frankly, I forgot to ask about the version of Safari, and it's an important answer to know.
Of course!
OSX Yosemite 10.10.5 and Safari Versie 10.1.2 (10603.3.8)
Could it be the fault of MacOS 10.10 and not Safari itself? The SSLLabs clients tested are Safari 8 on MacOS 10.10 or Safari 9 on MacOS 10.11. So with aid of SSLLabs we can't distinguish MacOS or Safari..
Also, MacOS Yosemite 10.10 isn't supported any longer according to Wikipedia: Support status
Unsupported as of August 2017.
Anyone with Safari 10 but MacOS 10.11 who can reproduce this error?
Also: @hansvmourik You can surf to the page https://clienttest.ssllabs.com:8443/ssltest/viewMyClient.html to see all the capabilities of your browser/OS combination. You'll probably see there is no overlap between your browser/OS and the SSLLabs analysis of your site. Probably the cipher suits like @JuergenAuer already mentioned.
It's your choice: do you add less secure cipher suits so your site supports unsupported browsers/OSses? Or do you upgrade your browser/OS? (Probably OS in your situation.)
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