Test TLS version

(2021-10-06)

Problem

Does this device support TLS v1.0 (or 1.1 or 1.2 or 1.3)

Solution

$ openssl s_client -connect system:port -tls1
$ openssl s_client -connect system:port -tls1_1
$ openssl s_client -connect system:port -tls1_2
$ openssl s_client -connect system:port -tls1_3

If you get cert details back from any of those, the device does support the referenced TLS version.