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(With great thanks to @Tetsujin for pointing me in the right direction) Looking up details of the certificates, in browsers that allow doing that and in Keychain Access, showed that all the breakage was traceable to a "VeriSign Class 3 Public Primary Certification Authority - G5" which was untrusted; I haven't figured out why that was, and it wasn't ...


As you already remarked, the use of ciphers and protocol version is application specific. The easiest way to check which ciphers and protocol version is currently used by an application is to either use wireshark to sniff and look at the TLS handshake (ClientHello contains the cipher offers) or to use some server which displays these information from the SSL ...

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