To test whether your server is TLS1.2 compatible, perform these instructions from a Linux desktop.  

Alternatively, here are versions of Operating Systems and Applications that commonly support TLS1.2: 

Windows  

• Windows 7 

• Windows Server 2008 R2+ 

 
Linux 
Linux applications are primarily dependent on the OpenSSL version installed. The examples provided are platforms where the default OpenSSL included is sufficiently new:  

• Ubuntu - 12.04 (Precise) or better 

• Red Hat / CentOS - v6+ 

• Debian - 7.0 (Wheezy) 

 
OpenSSL 
This needs to be at least version 1.0.1. 

 
.NET 
Version 4.6 defaults to TLS 1.2. Version 4.5 and below require a specific flag for TLS to be set, however, for versions below 4.5 your system will still need .NET 4.5 Installed to support TLS 1.2. 
 
Java 
Version 8 (1.8) defaults to TLS 1.2. Java 7 (1.7) needs to be told to use TLS 1.2. 
 
PHP/Ruby/Node.js 
These rely mostly on OpenSSL to handle TLS needs. Check that your version of OpenSSL is at least 1.0.1.