A complete list of supported encryption protocols for TLS1.2 based on the operating system is shown in the boxes below.

RHEL 7.6
ECDHE-RSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-GCM-SHA256
ECDHE-ECDSA-AES256-GCM-SHA384 DH-RSA-AES128-GCM-SHA256
ECDHE-RSA-AES256-SHA384 ECDHE-RSA-AES128-SHA256
ECDHE-ECDSA-AES256-SHA384 ECDHE-ECDSA-AES128-SHA256
DHE-DSS-AES256-GCM-SHA384 DHE-DSS-AES128-GCM-SHA256
DHE-RSA-AES256-GCM-SHA384 DHE-RSA-AES128-GCM-SHA256
DHE-RSA-AES256-SHA256 DHE-RSA-AES128-SHA256
DHE-DSS-AES256-SHA256 DHE-DSS-AES128-SHA256
ECDH-RSA-AES256-GCM-SHA384 ECDH-RSA-AES128-GCM-SHA256
ECDH-ECDSA-AES256-GCM-SHA384 ECDH-ECDSA-AES128-GCM-SHA256
ECDH-RSA-AES256-SHA384 ECDH-RSA-AES128-SHA256
ECDH-ECDSA-AES256-SHA384 ECDH-ECDSA-AES128-SHA256
AES256-GCM-SHA384 AES128-GCM-SHA256
AES256-SHA256 AES128-SHA256
ECDHE-RSA-AES128-GCM-SHA256

Ubuntu 16.04
ECDHE-RSA-AES256-GCM-SHA384 DHE-DSS-AES128-GCM-SHA256
ECDHE-ECDSA-AES256-GCM-SHA384 DHE-RSA-AES128-GCM-SHA256
ECDHE-RSA-AES256-SHA384 DHE-RSA-AES128-SHA256
ECDHE-ECDSA-AES256-SHA384 DHE-DSS-AES128-SHA256
DHE-DSS-AES256-GCM-SHA384 ECDH-RSA-AES128-GCM-SHA256
DHE-RSA-AES256-GCM-SHA384 ECDH-ECDSA-AES128-GCM-SHA256
DHE-RSA-AES256-SHA256 ECDH-RSA-AES128-SHA256
DHE-DSS-AES256-SHA256 ECDH-ECDSA-AES128-SHA256
ECDH-RSA-AES256-GCM-SHA384 AES128-GCM-SHA256
ECDH-ECDSA-AES256-GCM-SHA384 AES128-SHA256
ECDH-RSA-AES256-SHA384 DH-RSA-AES128-GCM-SHA256
ECDH-ECDSA-AES256-SHA384 DH-DSS-AES128-GCM-SHA256
AES256-GCM-SHA384 DH-RSA-AES128-SHA256
AES256-SHA256 DH-DSS-AES128-SHA256
ECDHE-RSA-AES128-GCM-SHA256 DH-DSS-AES256-GCM-SHA384
ECDHE-ECDSA-AES128-GCM-SHA256 DH-RSA-AES256-GCM-SHA384
ECDHE-RSA-AES128-SHA256 DH-RSA-AES256-SHA256
ECDHE-ECDSA-AES128-SHA256 DH-DSS-AES256-SHA256