If you have access to OpenSSL you can issue the command:
echo /dev/null | openssl s_client -showcerts -connect address:port -ssl3
If SSLv3 then the 1st line returned will end with "SSL alert number 70" or "SSL
alert number 40". If it is supported you will see the certs.
You can change -ssl3 to -tsl1_2 to verify that it is supporting TLS V1.2.
Rocket Software has a port of OpenSSL that will run on z/OS, or you can get it
for Linux. Not sure if there is a Windows version, but I run it under Cygwin
on Windows.
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