Consider using the following to test connection methods:
openssl s_client -connect domain.com:443 -tls1_2
| OS | OpenSSL version | SSL2 | SSL3 | TLSv1 | TLSv1.1 | TSLv1.2 |
|---|---|---|---|---|---|---|
| Rhel/CentOS 5 | 0.9.8e | yes | yes | yes | no | no |
| Rhel/CentOS 6 | 1.0.1e | yes | yes | yes | yes | yes |
| Rhel/CentOS 7 | 1.0.1e | yes | yes | yes | yes | yes |
| Ubuntu 12.04 | 1.0.1 | yes | yes | yes | yes | yes |
| Ubuntu 14.04 | 1.0.1f | yes | yes | yes | yes | yes |
| Debian 7 | 1.0.1e | yes | yes | yes | yes | yes |
| Debian 8 | 1.0.1k | yes | yes | yes | yes | yes |
| Rackspace Cloud Load Balancers | Unknown | no | *yes | *yes | *yes | yes |
* – cannot be disabled