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I'm trying to use a GRPC client which is TLS 1.3 enabled on my system (Ubuntu 20.04). I'd like to force it to connect over TLS 1.2: I don't see any options to control this, so I thought I'd try disabling TLS 1.3 system-wide.

How do I do this? I tried adding

MaxProtocol = TLSv1.2

to my /etc/ssl/openssl.cnf as this page seems to suggest*, but my GRPC traffic continues over TLS 1.3 (perhaps I'm not reloading the config or something?). I've heard mention of boringssl when it comes to GRPC as well, so perhaps that has something to do with things.

  • I added it as the second line, right after HOME = .: you can see the whole file here
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